Central Heating Engineers London

Central Heating Engineers London

In our modern-day homes, central city-systems seem to always have to stay. This functional and effective heating system is one of the best every homeowner will wish to have in their home to take them through the cold winter months in the city of London. Are you planning to install one of this in your home? Then you will be needing the services of a central heating engineers London.

When it comes to installing, repairing and maintaining central heating systems, we are a force to be reckoned with. Over services cut across just providing a reliable system for your home, we are here to provide an environmentally friendly heating system that will give you the best.

We understand your needs as an individual. And as such, our services as standard central heating engineers London covers good customer services, topnotch repairs, and servicing, effective and swift installation.

London Central Heating Engineers

Unlike others, we don’t just fix your heating problems never to take time out to check how your heating system is coming up. It’s our habit to always check back and see if you are having any form of difficulties and get it fixed. With this, you should be assured that the guarantee we have in place for you aren’t just mere promises but tasks that we consider as part of our services.

Besides, our team comprises of not just engineers but also technicians and electricians with their respective specialties. This automatically means none of our personnel is a “Jack of all trades, master of none”. We work collectively as a team with the primary objective of giving you the best of home heating.

Finally

Do you wish to replace your old central heating systems with new ones? We take care of that as well. Being competent Central Heating Engineers London, we will help you to make the right decision as to which central heating system will be best for your home. And at the same time help you with the proper recycling of your old central heating.

Our goal is to give you the best and we aren’t going to compromise on that for any reason whatsoever.

Get In Touch

You can contact Master Gas 24 hours a day and a member of our team will only be pleased to receive your call request.
By using Master Gas you can rest assured that your job will be completed by experts and to your satisfaction, not forgetting, of course, our workmanship guarantee. Call today
0203 667 7276

 

    Boiler Replacement London

    Baxi Boiler Error Codes

    Fault Code Possible Cause
    E20 Central heating NTC error
    E28 Error with the NTC (Negative Temperature Coefficient) flue, air pressure switch or blocked flue or condensate
    E50 Hot water NTC (Negative Temperature Coefficient) error
    E110 Thermostat operated safety
    E119 Water pressure switch error – not operated.
    E125 Primary circuit error circulation fault
    E130 Flue NTC (Negative Temperature Coefficient) operation error
    E133 Gas supply error or flame failure
    E160 Fan or fan wiring error
    E193 Pre-circulation error
    Fault Code Possible Cause
    110 Overheated – try bleeding your radiators
    117 Water pressure too high
    118 Water pressure too low
    125 Water circulation fault
    133 Safety time to establish flame exceeded
    E10 Outdoor sensor error
    E20 Central heating thermistor sensor fault
    E28 Flue thermistor fault
    E54 Domestic hot water (DHW) flow sensor fault
    E78 Water pressure sensor fault
    E100 Internal clock time error on printed circuit board (PCB)
    E109 Poor circulation
    110 Overheat – try bleeding your radiators
    111 Maximum limit of flow temperature
    117 Water pressure too high
    118 Water pressure too low
    119 System pressure too low
    125 Water circulation fault
    127 Legionella (cause of Legionnaires’ disease) protection temperature not reached
    128 Loss of flame during operation
    133 Safety time to establish flame exceeded
    153 Forced reset unit unlocked
    160 Fan fault
    162 Air pressure switch error
    164 Pressure Sensor Error (UK) – Heating flow switch error (Ireland)
    166 Air pressure switch fault
    270 Dry fire
    432 Earth connector error
    433 Heat exchanger temperature exceeded (greater than 95 degrees)
    Fault Code Possible Cause
    1 green flash Boiler temperature reached. No action required.
    3 green flashes Temporary flame loss. Boiler will self reset, if fault continues you will see 3 red flashes.
    4 green flashes Communication error between printed circuit board (PCB) and control. Temporary error, will self reset.
    5 green flashes Parameter error on printed circuit board (PCB). Temporary error, will self reset
    6 green flashes Miscellaneous error. Temporary error, will self reset.
    1 red flash Sensor error, temperature fault or flow fault.
    2 red flashes Boiler overheat tripped
    3 red flashes Ignition fault. Boiler has attempted to light 5 times and failed.
    4 red flashes Fan fault
    5 red flashes Parameter storage unit (PSU) error.
    6 red flashes Miscellaneous error.
    Fault Code Possible Cause
    E10 Outdoor sensor fault
    E20 Central heating thermistor sensor error
    E28 Flue thermistor error
    E110 Boiler overheat error
    E119 Low water pressure error
    E125 Primary water circulation error
    E131 Flue overheat lockout error
    E133 Ignition error
    E160 / E161 Fan error
    E164 Pressure sensor fault
    E167 Printed circuit board (PCB) error
    E168 Printed circuit board (PCB) lockout error
    E193 Circulation error
    Fault Code Possible Cause
    H.01 – .00 Loss of communication between gas valve and boiler board. Possible fault in air/gas unit or loose connection to gas valve.
    H.01 – .05 Difference between the flow and return temperature is too high, sensor error or insufficient circulation.
    H.01 – .08 Sensor fault, flow temperature increasing too fast in heating mode or insufficient circulation.
    H.01 – .14 Maximum flow temperature value exceeded or insufficient circulation – temporary fault.
    H.01 – .18 No water circulation, insufficient circulation or sensor error.
    H.01 – .21 Temporary error – flow temperature increasing too fast in domestic hot water (DHW) mode, insufficient circulation or sensor error.
    H.02 – .02 Temporary error – no input of parameters C1/C2. Printed circuit board (PCB) not configured.
    H.02 – .03 Temporary error- incorrect configuration settings C1/C2.
    H.02 – .04 Temporary error- parameter fault. Incorrect parameters.
    H.02 – .06 Temporary error caused by system water pressure, water leak on boiler, water leak on system.
    H.03 -.00 Temporary error with communication, negative temperature coefficient thermostat (NTC) or flue sensor. Sensor could also be unconnected or have a bad connection.
    H.03 – .01 Communication error with the printed circuit board (PCB)
    H.03 – .02 Flame error – no flame during operation.
    E.00 – .04 Return temperature sensor open-circuit. Sensor not or badly connected.
    E.00 – .05 Return temperature sensor short-circuit. Sensor not connected or badly connected.
    E.01 – .02 Temperature measured by return sensor greater than flow sensor.
    E.01 – .04 Loss of flame detected 5 times in 24 hours (with burner on).
    E.01 – .11 Incorrect fan speed – external draught over the boiler or defective gas/air unit.
    E.01 – .12 Requires reset – temperature measured by return sensor greater than flow temperature.
    E.01 – .17 Reset the boiler – no circulation, sensor fault either not connected or has a bad connection.
    E.01 – .20 Maximum flue gas temperature reached. No circulation or sensor fault.
    E.02 – .00 Reset button has been pressed.
    E.02 – .07 No or low system water pressure. system pressure less than 0.5bar
    E.02 – .16 Permanent fault caused by channel service unit (CSU) time-out or printed circuit board (PCB) damage.
    E.02 – .17 Loss of communication between gas valve and boiler printed circuit board (PCB) or fault in air/gas unit.
    E.02 – .19 Jumper 1 changed – check position of jumper 1.
    E.02 – .20 Jumper 2 changed – check position of jumper 2.
    E.02 – .21 Jumper 3 changed – check position of jumper 3.
    E.02 – .47 Wiring to external device error.
    E.02 – .48 Configuration to external device unsuccessful – check pairing to external device.
    E.04 – .00 Gas valve error – gas valve not detected.
    E.04 – .01 Flow temperature sensor short-circuited. Sensor not or badly connected, bad connection or sensor fault.
    E.04 – .02 Permanent fault. Flow temperature sensor open-circuited, sensor not or badly connected, bad connection or sensor fault.
    E.04 – .03 Permanent fault. Critical flow temperature reached, non-existent or insufficient circulation.
    E.04 – .04 Permanent fault. Flue temperature sensor short-circuited, sensor not or badly connected, bad connection or sensor fault.
    E.04 – .05 Permanent fault. Flue temperature sensor short-circuited, sensor not or badly connected, bad connection or sensor fault.
    E.04 – .06 Permanent fault. Critical flue gas temperature value reached, no circulation or sensor fault.
    E.04 – .08 Permanent fault. Maximum safe temperature value reached, safety thermostat open-circuited, no circulation, sensor not or badly connected, bad connection or sensor fault.
    E.04 – .10 Failure to light (could be gas supply issue).
    E.04 – .12 Permanent fault. False flame signal, short-term fluctuation of the mains, ionization current present even though there is no flame, the burner remains very hot (CO2 too high) or defective gas/air unit.
    E.04 – .13 Permanent fault. Fan rotor blocked, fan seized or wiring to fan damaged.
    E.04 – .17 Permanent fault. Problem with gas valve or defective gas/air unit.
    Fault Code Possible Cause
    E09 Gas valve connection cable.
    E10 External probe fault.
    E12 Differential water flow switch fault (still open).
    E13 Differential water flow switch fault (still closed).
    E15 Gas valve command fault.
    E20 Central heating negative temperature coefficient (NTC) thermostat fault.
    E28 Flue negative temperature coefficient (NTC) thermostat fault.
    E40 Central heating return negative temperature coefficient (NTC) thermostat fault.
    E50 Domestic hot water (DHW) negative temperature coefficient (NTC) thermostat sensor fault (tank boiler) (s.c.) or DHW NTC sensor fault (tank boiler) (o.c.).
    E83/E84/E85/E86/E87 No communication.
    E109 Pre-circulation fault.
    E110
    • Boiler max temperature exceeded for gradient (probable pump jammed or air in the circuit
    • Boiler max temperature exceeded for overtemperature (probable pump jammed or air in the circuit
    • Safety thermostat sensor tripped.
    E118 Primary system water pressure too low (< 0.5 bar).
    E125 Circulation fault (primary).
    E128 Frequent flame failure (12 times).
    E129 Safety error for frequently loss of flame with max correction during the ignition during Calibration Function.
    E130 Flue thermostat sensor tripped (lockout).
    E133 Failure to light (could be a gas supply issue).
    E134 Elapsed time gas valve open without gas
    (short request in a short period)
    E135 Interruption of gas supply (internal error).
    E154 Flow/return sensor temperature test.
    E160 Fan or fan wiring fault.
    E163 Domestic hot water (DHW) negative temperature coefficient (NTC) thermostat sensor fault (s.c.) or DHW NTC sensor fault (o.c.).
    E270 Circulation fault (dry fire).
    E317 Wrong power supply electrical frequency (Hz).
    E321 Hot water negative temperature coefficient (NTC) fault.
    E384 False flame.
    E385 Under voltage.
    E430 Water pressure temporary test.
    E430 + Flame ‘crossed’ Water pressure test failed.
    Fault Code Possible Cause
    1 Green Flash Boiler temperature reached – no action required
    3 Green Flashes Temporary flame loss – this is a temporary error, the system should reset on its own
    4 Green Flashes Communication error between printed circuit board (PCB) and Control – this is a temporary error, the system should reset on its own
    5 Green Flashes Parameter error on parameter storage unit (PSU) or printed circuit board (PCB) – this is a temporary error, the system should reset on its own.
    6 Green Flashes Miscellaneous error
    1 Red Flash Sensor error, sensor fault, temperature fault or flow fault – this is a temporary error, the system should reset on it’s own.
    2 Red Flashes Boiler overheat tripped
    3 Red Flashes Ignition fault. Boiler has attempted to light 5 times and failed
    4 Red Flashes Fan Fault
    5 Red Flashes Parameter storage unit (PSU) error
    6 Red Flashes Miscellaneous
    Fault Code Possible Cause
    E0 Temperature sensor fault
    E1 Overheated – try bleeding your radiators
    E2 Poor circulation – try bleeding your radiators
    E3 Printed circuit board (PCB) fault
    E4 Ignition failure – try bleeding your radiators
    E10 Poor/No circulation
    E12 Printed circuit board (PCB) Fault
    E13 Heat exchanger thermal fuse tripped
    E83 / 84 / 85 / 86 / 87 Fan fault normally E8
    Fault Code Possible Cause
    E53 Poor combustion – flue terminal may be blocked
    E110 Overheated – try bleeding your radiators
    E117 System water pressure high – try bleeding water from your radiators
    E118 System water pressure low
    E125 Overheat – try bleeding your radiators
    E133 Gas supply fault
    E4 Ignition failure
    E09 Gas valve wiring fault
    E10 Outdoor sensor error
    E15 Gas valve connection fault
    E20 Central heating thermistor sensor fault
    E28 Flue thermistor fault
    E40 Central heating return thermistor fault
    E53 Flue obstruction
    E55 Calibration required
    E78 Water pressure sensor fault
    E92 Combustion test alarm during auto-setting
    E109 Poor circulation
    E110 Boiler overheat tripped
    E117 System pressure high (>2.9 Bar)
    E118 System pressure low(< 0.5bar)
    E125 Primary water circulation fault
    E128 Loss of flame during operation
    E129 Loss of flame during calibration
    E133 Ignition fault
    E135 Internal error
    E154 Primary flow fault
    E160 Fan fault
    E270 Dry fire
    E317 Wrong power supply (Hz)
    E321 Not water thermistor fault
    E384 Flame detected when gas valve off
    E385 Low voltage (less than 195v)
    Fault Code Possible Cause
    FLASH FLASH ON Fan error
    FLASH OFF FLASH Voltage less than 180V
    FLASH OFF ON Overheat lockout
    FLASH ON FLASH Printed circuit board (PCB) error
    FLASH ON ON Printed circuit board (PCB) fault
    OFF OFF OFF No power
    ON FLASH FLASH Circulation error or dry fire
    ON FLASH ON Thermistor error
    ON OFF FLASH Live and neutral reversed error
    ON OFF ON Ignition lockout error
    ON ON FLASH Printed circuit board (PCB) error
    ON ON ON Low voltage wiring harness error

    Glow Error Codes

    Boiler Model Fault Code Cause of Problem
    Betacom Red LED on Lockout – low water pressure (increase pressure to 1.5bar) and reset boiler
    Betacom Red LED flashing Overheat – check both overheat stats
    Betacom Yellow LED flashing Turn domestic hot water (DHW) control knob into temperature range and turn central heating (CH) temperature control knob into power (reset position) and wait for minimum of 30 seconds before turning into either summer or temperature position
    Betacom Yellow LED on Flame present on the burner
    Betacom Green LED on Boiler ready for operation
    Betacom Green LED off No power to boiler – Check for 230volts into the appliance, check fuse on printed circuit board (PCB)
    Betacom / Ultracom₂ cxi / sxi / 35 F00 / F10 / F71 Flow heating temperature sensor fault
    Betacom / Ultracom₂ cxi / sxi / 35 F01 / F11 Return heating temperature sensor fault
    Betacom / Ultracom₂ cxi / sxi / 35 F20 Overheating fault
    Betacom / Ultracom₂ cxi / sxi / hxi / 35 / Flexicom cx / hx / sx F9 / F22 Low water pressure (or ignition temperature rise too slow)
    Betacom / Ultracom₂ cxi / sxi / 35 F26 / F77 Fault in gas valve
    Betacom / Ultracom₂ cxi / sxi / 35 / CI / hxi / Xtramax HE F27 / F16 Flame detection fault
    All Boilers F28 / F1 / F4 Ignition fault (flame detection)
    Betacom / Ultracom₂ cxi / sxi / 35 F29 Loss of flame during operation
    Betacom / Ultracom₂ cxi / sxi / 35 F32 Incorrect air pressure
    Betacom / Ultracom₂ cxi / sxi / 35 F49 EBUS voltage fault
    Betacom / Ultracom₂ cxi / sxi / 35 F61 / F62 / F63 / F64 / F65 / F67 Fault in the main board
    Betacom / Ultracom₂ cxi / sxi / 35 F68 Fluctuation of flame signal
    Betacom / Ultracom₂ cxi / sxi / 35 F70 User interface incompatible with the main board
    Betacom / Ultracom₂ cxi / sxi / 35 F72 / F84 Permanent temperature difference between flow and return heating sensors
    Betacom / Ultracom₂ cxi / sxi / 35 F73 / F74 Heating circuit pressure sensor fault
    Betacom / Ultracom₂ cxi / sxi / 35 F76 Thermal fuse fault
    Betacom / Ultracom₂ cxi / sxi / 35 F83 Thermal fuse fault
    Betacom / Ultracom₂ cxi / sxi / 35 F85 Flow and Return heating sensor fault
    Betacom / Ultracom₂ cxi / sxi / 35 F86 Underfloor heating contact fault
    All Boilers ERR / F12 / F18 User interface fault
    Betacom c Temperature 30 flashing Fault on central heating (CH) thermistor
    Betacom c Temperature 40 flashing Fault on DHW thermistor
    Betacom c Temperature 50 flashing Fault on outside sensor
    Betacom c Temperature 60 flashing Low system pressure
    Betacom c Temperature 70 flashing Fault on APS
    Betacom c Temperature 80 flashing Overheat open circuit
    Betacom c Temperature 90 flashing Flame or gas failure
    Compact e / s No DHW Check dhw microswitch / Check external controls, Please test for 230V on switch live contact
    Compact e / s No C/H Check dhw microswitch if dhw demand led is lit / Check external controls, Please test for 230V on switch live contact
    Compact e / s No C/H but boiler is firing Check divertor motor and cartridge / Check external controls, Please test for 230V on switch live contact
    Compact e / s Boiler locks out within 10 seconds Check pump proving switch, air pressure switch and overheat state / Check pump proving switch, air pressure switch and overheat stat
    Compact e / s Poor burner pressure Check burner pressure/ignition adjustment pots on PCB
    Ci Range (plus) / Si range F2 Fan/APS
    All Boilers F5 Overheat Fault
    All Boilers F6 Central heating flow thermistor
    All Boilers F7 Domestic hot water thermistor
    All Boilers F8 Tank thermistor fault
    sxi / si / ci (plus) range / Xtramax HE F9 Water pressure sensor fault (please contact GW technical department for further information)
    All boilers F10 Central return flow thermistor
    All boilers F11 Main board connection fault
    Ci (plus) / cxi / hxi / si / sxi range F12 Connection fault between main printed circtuit board (PCB) and display PCB
    Ci (plus) / cxi / hxi / si / sxi range F13 Main pcb connection fault
    Ci (plus) / cxi / hxi / si / sxi range F14 Central heating flow temperature > 95 degrees
    Ci (plus) / cxi / si / sxi range F15 Gas valve stepper motor fault
    Ci (plus) / cxi / hxi / si / sxi range / Xtramax HE F17 Power supply is less than 170v
    Ci (plus) / cxi / hxi / si / sxi range / Xtramax HE F19 Central heating thermistor unplugged
    Ci (plus) / cxi / hxi / si / sxi range / Xtramax HE F20 Software incompatibility
    cxi / hxi / sxi range / Flexicom cx F24 Central heating return temperature > 90 degrees
    cxi / hxi / sxi / Xtrafast 96/120 / Xtrafast 96/120E1 F25 / F26 / F11 Poor circulation
    ci range F3 Air fault
    ci range F3 Air fault
    cxi / sxi / hxi range/ Xtramax HE F2 / F3 Fan
    cxi / sxi range / Flexicom cx / hx / sx / hxi / Ultracom cxi / cx / hxi / sxi / Ultrapower sxi F3 Fan unable to reach ignition speed
    Flexicom cx / hx / sx / hxi / Ultracom cxi / cx / hxi / sxi F9 Water pressure sensor fault, blocked flow filter or pump fault
    Flexicom cx / hx / sx F11 Flow and or return thermistor fault
    Flexicom cx / hx / sx / Ultracom cxi / cx / hxi / sxi / Xtramax HE F13 PCB memory or sensing fault
    Flexicom cx / hx / sx / Ultracom cxi / cx / hxi / sxi / Xtramax HE F14 Gas valve control defective
    Flexicom cx / hx / sx / Ultracom cxi / cx / hxi / sxi / Xtramax HE F15 E-bus voltage failure
    All boilers F25 / F23 Circulation fault
    Flexicom cx / hx / sx / Ultracom cxi / cx / hxi / sxi F43 Generic error
    Flexicom cx / hx / sx / Ultracom cxi / cx / hxi / sxi F70 Software incompatible
    Flexicom cx / hx / sx / Ultracom cxi / cx / hxi / sxi F73 Unable to see pump activate
    Flexicom cx / hx / sx / Ultracom cxi / cx / hxi / sxi F77 Condensate pump error (optional)
    hxi range F9 Earlier models only (please contact GW technical department for further information)
    hxi range F9 Earlier models only (please contact GW technical department for further information)
    Ultracom₂ 35 Store F02 / F12 Hot water temperature sensor fault
    Ultracom₂ 35 Store F03 / F13 / F79 Storage tank temperature sensor fault
    Ultracom₂ 35 Store F81 Overheating of hot water circuit
    All Ultracom No display or Er loose connection X51
    Xtramax HE Range F24 Cental heating return temperature > 90 degrees
    Xtramax HE Range F25 Maximum temperature rise slope
    Xtramax HE Range F26 Maximum delta temperature
    Xtrafast 96/120 Range F00 No fault/td>
    Xtrafast 96/120 Range / Xtrafast 96/120E1 Range F00 No fault
    Xtrafast 96/120 Range / Xtrafast 96/120E1 Range F02 Air flow fault
    Xtrafast 96/120 Range / Xtrafast 96/120E1 Range F05 Overheating
    Xtrafast 96/120 Range / Xtrafast 96/120E1 Range F06 Central heating thermistor/wiring fault
    Xtrafast 96/120 Range / Xtrafast 96/120E1 Range F08 Storage vessel thermistor/wiring fault
    Xtrafast 96/120 Range / Xtrafast 96/120E1 Range F09 System pressure sensor fault
    Xtrafast 96/120 Range / Xtrafast 96/120E1 Range F10 Fan fault
    Xtrafast 96/120 Range / Xtrafast 96/120E1 Range F13 Main printed circuit board (PCB) fault
    Xtrafast 96/120 Range / Xtrafast 96/120E1 Range F14 Central heating flow temperature > 97 degrees
    Xtrafast 96/120 Range / Xtrafast 96/120E1 Range F15 Gas mechanism fault
    Xtrafast 96/120 Range / Xtrafast 96/120E1 Range F20 Communication fault
    Fault Code Cause of Problem
    F.00 Flow temperature sensor
    F.00 Flow temperature sensor
    F.10 Flow temperature sensor short circuit
    F.11 Flow temperature sensor short circuit
    F.12 and F.91 Cylinder temperature sensor short circuit
    F.13 Domestic hot water cylinder temperature sensor short circuit
    F.20 Safety switch-off – overheating temperature reached
    F.22 Safety switch-off – low water pressure in the boiler
    F.23 Safety switch-off – temperature difference too great (NTC1/NTC2)
    F.24 Safety switch-off – temperature rise too fast
    F.25 Safety switch-off – flue gas temperature too high
    F.27 Safety switch-off – fault in flame detection
    F.28 Ignition unsuccessful when starting up
    F.29 Flame loss
    F.32 Fan frost protection function active – fan speed outside the tolerance values
    F.33 Fan frost protection function active – air pressure switch fault
    FA9 eBUS fault – voltage too low
    F.61 Gas valve control system fault
    F.82 Gas valve switch-off control fault
    F.83 EEPROM fault – electronics defective
    F.64 Electronics/sensor/analogue-to-digital converter fault
    F.85 Electronics temperature too high
    F.67 Value sent back by ASIC is incorrect (flame slgnal)
    F.88 Unstable flame (analogue input), underfloor heating contact or gas valve fault
    F.70 Invalid product code (DSN)
    F.71 Flow/return temperature sensor
    F.72 Deviation in the water pressure sensor/return temperature sensor
    F.73 Water pressure sensor not connected or has short-circuited
    F.74 Electrical problem in the water pressure sensor
    F.75 Pressure sensor fault
    F.78 The safety cut-out in the primary heat exchanger is defective
    F.77 Fault: Condensate or smoke
    F.78 Interruption to domestic hot water (DHW) outlet sensor at external controller
    F.83 Burner temperature sensor fault
    F.84 Flow/return temperature sensor fault
    F.85 Temperature sensor fault
    F.87 Electrodes fault
    F.89 Pump fault
    Connection No communication between the printed circuit board (PCB) and the user interface

    Ideal Error Codes

    Fault Description System Behaviour
    L1 Flow temperature overheat lockout or no water flow lockout
    L2 Ignition lockout
    LC 5 restarts within 15 minutes
    L6 False flame lockout
    FA Flow return reversed
    FD No water flow
    F2 or FN or LN Flame loss
    F3 Fan fault
    L4 or F4 Control / no flow thermistor fault
    L5 or F5 Return thermistor fault
    F6 Outside sensor fault
    F7 Low mains voltage Contact electricity provider
    F9, L9, F8 or L8 Printed circuit board (PCB) unconfigured or fault
    FU Diff greater than 50c check isolation valves are open
    Fault Code System Behaviour
    C0 Boiler chip card (BCC) activation fault
    C2 Boiler chip card (BCC) fault
    F1 Low water pressure
    F2 Flame loss
    F3 Fan fault
    F4 Flow thermistor fault
    F5 Return thermistor fault
    F6 Outside sensor failure
    F7 Low mains voltage
    F9 Unconfigured printed circuit board (PCB)
    L1 Flow temperature overheat or no water flow
    L2 Flame loss
    L5 5 boiler resets in 15 minutes
    L6 False flame lockout

     

    Fault Code System Behaviour
    0 The boiler is in standby mode awaiting either a central heating call or hot water demand
    C The boiler has a call for central heating but the appliance has reached the desired temperature set on the boiler
    D The boiler has a call for hot water but the appliance has reached the desired temperature set on the boiler
    C The boiler is operating in central heating mode
    d The boiler is operating in hot water mode
    F The boiler is operating in frost mode
    Fault Description System Behaviour
    L1 Flow temperature overheat lockout or no water flow lockout
    L2 Ignition lockout
    LC 5 restarts within 15 minutes
    L6 False flame lockout
    FA Flow return reversed
    FD No water flow
    F2 or FN or LN Flame loss
    F3 Fan fault
    L4 or F4 Control / no flow thermistor fault
    L5 or F5 Return thermistor fault
    F6 Outside sensor fault
    F7 Low mains voltage Contact electricity provider
    F9, L9, F8 or L8 Printed circuit board (PCB) unconfigured or fault
    FU Diff greater than 50c check isolation valves are open
    Fault Description System Behaviour
    Overheat lockout Bleed radiators, refill system to 1.0 bar, check that radiator and boiler valves are open and reset boiler. If fault continues book an engineer.
    Ignition lockout Check gas appliances work and restart boiler.
    Too many restarts 5 starts within 15 minutes. Turn power on and off.
    Flame on before gas on False flame lockout.
    Water pressure With boiler off and system cold fill system to 1.0 bar and bleed radiators if fault continues contact an installer.
    Fault Description System Behaviour
    Too many resets 5 restarts within 15 minutes
    Flame on before gas valve on Flame on before gas valve is on
    Flow thermistor fault Flow thermistor error
    Low mains voltage Less than 185v to boiler then check voltage at boiler mains in if mains voltage is okay pump needs replacing
    Low water pressure Low water pressure
    Flow return reversed Check if the flow thermistor is correctly clipped to pipe. If not, replace flow thermistor.
    Printed circuit board (PCB) recently replaced Reset boiler
    Pump rotor blocked Unblock pump
    Flow temperature setpoint cannot be increased to 80c Check flow and return thermistors securely clamped to pipes check flow and return thermistor
    Fault Description Cause
    Thermal fuse lockout Reset the boiler
    Too many boiler resets 5 resets within 15 minutes. Turn power off and on.
    Printed circuit board (PCB) replaced incorrectly Ensure the boiler chip card (BCC) is fitted correctly.
    Low mains voltage Less than 160V to boiler. Contact electricity provider.
    Low water pressure Increase system pressure to 1.5 bar
    Flow/Return reversed Check if flow thermistor is correctly clipped to pipe. Replace flow thermistor.
    Printed circuit board (PCB) replaced Reset the boiler
    No connection to primary printed circuit board (PCB) Unblock pump
    Pump rotor blocked No connection to primary printed circuit board (PCB)
    Flow temperature setpoint cannot be increased to 80ºC Ensure flow temperature is not limited within installer mode
    Pump runs during the night Ensure system frost protection temperature setpoint isn’t set too high
    Has the printed circuit board (PCB) just been replaced? Reset the boiler
    Are the boiler, central heating and hot water systems filled with water? Are all isolation valves and radiator valves open? Fill and vent the system and open all isolation valves, then reset the boiler
    Is the Flow/Return differential across the boiler in excess of 30c Check the flow and return thermistors
    Check that the pump is rotating freely. Replace the pump, then reset the boiler
    If the boiler is reset, does it ignite for a short time and then extinguish? Check the detection electrode and associated harness for continuity, visual condition and position. Check if the condensate pipe is blocked.
    Is the gas pressure avaliable at the boiler > 18mBar Check gas supply and rectify fault
    Is 215Vdc avaliable at the gas valve during ignition? Check wiring from gas valve to printed circuit board (PCB) and replace if necessary, otherwise replace the main PCB
    Unplug the gas valve – is the resistance between the pins between 1kW and 10kW? Replace gas valve

    Vaillant Boiler Error Codes

    Fault Code Possible Cause Meaning
    F.00 NTC Faults This means that your Flow NTC (Negative Temperature Coefficient Thermistor) cable is either defective or broken and needs to be replaced
    F.01 The Flow NTC (Negative Temperature Coefficient Thermistor) cable is either defective or broken and needs to be replaced
    F.10
    F.11
    F.13
    F.20 Boiler has exceeded the maximum temperature and needs to cool down
    F.22 Dry fire / Low water in system / Overheat This means that there’s either no water in your system, you have a defective pump or the pump lead is defective
    F.24 Low water / Pump Failure / Blockage Pump could be obstructed, running at low capacity, could be air trapped or the pressure might be too low.
    F.28 Either insufficient gas in the system, a defective electrode, ignition lead or electronic ignitor
    F.29 Flame extinguished Flame or pilot light has gone out – check flue duct or gas supply.
    F.60 Gas valve control defective Cable loom (connects gas valve) might have short circuited, gas valve assembly defective or electronic control system issue.
    F.61 Gas valve control defective Cable loom (connects gas valve) might have short circuited, gas valve assembly defective or electronic control system issue.
    F.62 Defective gas valve closure mechanism Boiler has exceeded the maximum temperature and needs to cool down
    F.63 EEPROM (Electrically Erasable Programmable Read-Only Memory) error Electronic fault.
    F.64 Electronic system or sensor fault Flow or back flow NTC has short circuited, or an electronic fault
    F.65 Electronic system temperature too high This can happen because of an external heat source or an electrical fault
    F.67 Electronic fault in the flame system
    Fault Code Possible Cause
    F.1 Lack of gas, a fault with the ignition or flue – may need to adjust the gas valve or replace a defective electrode lead.
    F.4 Ignition fault.
    F.5 The system has suffered a fault due to overheating.
    F.6 Your flow NTC has developed a fault.
    F.17 Check the polarity of your system.
    F.24 Pump-related faults – the pump could have failed, it may have over run or there could be an issue with the airlock
    Fault Code Possible Cause
    F.00, .04, .05, .10, .14, .15 All of these are NTC faults, and are best resolved by first changing all NTC to make diagnosis earlier.
    F.21 The pilot flame has failed.
    F.22 There is insufficient water in your system.
    F.11 A blockage in the appliance is preventing the system from flowing as it should.
    F.12 A blockage in the appliance is affecting the system’s pressure.
    F.13 The appliance is blocked because of a water deficiency.
    Fault Code Possible Cause
    S.O Heating issue, no heat demand
    S.1 Fan start-up error
    S.2 Pump flow error
    S.3 Heating mode error – ignition problem
    S.4 Heat mode – burner on error
    S.6 Heating mode – fan overrun error
    S.7 Heating mode – pump overrun error
    S.8 Heating remaining cut off for XX amount of time
    S.31 No heat demand summer operating mode
    S.34 Heating mode frost protection error
    S.20 Hot water requirement error
    S.22 Hot water handling pump flow error
    S.24 Hot water operation burner is on
    S.85 Service message quantity of circulation water
    Fault Code Possible Cause
    F.00 / F.0 Flow temperature sensor interruption
    F.01 / F.1 Return temperature sensor interruption
    F.10 Flow NTC short circuit
    F.11 Return NTC short circuit
    F.20 Safety switch off temperature limiter
    F.22 Safety switch off low water pressure
    F.23 Safety switch off temperature difference too great
    F.24 Safety switch off temperature is rising to fast
    F.25 Safety switch off flue gas temperature too high
    F.26 Error with gas valve – possible no function
    F.27 Safety switch off flame simulation
    F.28 Failure during start up – ignition unsuccessful to start
    F.29 Failure during operation – re-ignition unsuccessful
    F.32 Fan error
    F.49 eBUS error – possible short circuit
    F.61 Error with gas valve regulation
    F.62 Error with gas valve – switch off delay
    F.63 EEPROM error
    F.64 Electronics / NTC error
    F.65 Electronic temperature error could be overheating due to external influences
    F.67 Electronics flame signal error
    F.68 Unstable flame signal error air in gas
    F.70 Invalid device specific number (DSN)
    F.71 Flow NTC error – flow temperature sensor signal constant value
    F.72 Flow return NTC error – temperature difference too great
    F.73 Water pressure sensor signal in the wrong range, it is too low
    F.74 Water pressure sensor signal outside correct range, the sensor signal is too high
    F.75 Error with pressure – no pressure change detection when starting the pump
    F.76 Overheating protection on – primary heat exchanger has responded
    F.77 Flue non return flap condensate pump error
    F.78 Interruption to DHW outlet sensor at external controller
    F.83 Flow and or return temperature sensor error
    F.84 Error with flow/return temperature sensor temperature changing error
    F.85 Error with flow and return temperature, sensor incorrectly fitted
    CONNECTION No communication with the PCB
    Fault Code Possible Cause
    S.00 Heating mode error – no heat demand
    S.01 Heating mode fan start-up
    S.02 Heating mode error – water pump running
    S.03 Heating mode – ignition sequence error
    S.04 Heating mode – burner ignited
    S.06 Heating mode – fan overrun error
    S.07 Heating mode – pump overrun error
    S.08 Heating remaining cut off time xx minutes
    S.10 Hot water demand via impeller sensor
    S.11 DHW mode fan start up error
    S13 DHW mode ignition error
    S.14 Hot water demand via fan sensor error
    S.15 DHW mode pump and fan overrun
    S.16 DHW mode – fan overrun error
    S.17 DHW mode – pump overrun error
    S.20 DHW mode – burner on error
    S.21 DHW mode – fan start up error
    S.22 DHW demand – error pump running
    S.23 DHW ignition error
    S.24 DHW mode – burner error
    S.25 DHW mode – pump or fan overrun error
    S.26 DHW mode – fan overrun
    S.27 DHW mode – pump overrun
    S.28 Hot water burner anti-cycling time
    S.30 Room thermostat is blocking heating mode
    S.31 No heat demand boiler in summer operating mode
    S.32 Waiting period because of fan speed deviation
    S.34 Heating mode frost protection error
    S.39 Burner off contact has been triggered this could be because of contact thermostat or condensate pump
    S.40 Comfort safety mode active
    S.41 Water pressure > 2.8 bar
    S.42 Flue non return flap return signal blocks burner operation
    S.46 Comfort safety mode flame loss at minimum load
    S.53 Boiler is in waiting period of modulation f block function due to water shortage
    S.54 Boiler is in waiting period of operation, blocking function as a result
    S.57 Waiting period comfort safety mode
    S.58 Modulation limitation due to noise / wind error
    S.61 Gas family check unsuccessful
    Fault Code Possible Cause
    S.20 Warnstar demand
    S.21 Fan running
    S.22 Pump running
    S.23 Ignition sequence
    S.24 Burner ignited
    S.25 Fan and water pump running
    S.26 Fan overrun
    S.27 Pump overrun
    S.28 Anti-cycling mode
    S.30 No heating demand from external controls
    S.31 Central heating thermostat knob turned off
    S.32 Heat exchanger antifreeze active as fan speed variation is too high
    S.34 Anti-frost mode is active
    S.36 Not heating demand form low voltage
    S.41 Water pressure greater than 2.9 bar
    S.42 Response from accessory module or defective condensate pump is blocking burner operation
    S.53 Appliance is within the waiting period of the block operation function due to water shortage
    S.54 Appliance is within the waiting period of the block operation due to water shortage
    S.96 Return sensor error
    S.98 Flow return sensor check is running demand is block
    D.0 Heating part load error
    D.1 Water pump overrun – time for heat mode
    D.2 Max burner anti-cycling period at 20c flow temperature
    D.3 Hot water flow temperature reading
    D.4 Current temperature for warm stat sensor
    D.7 Warm start temperature target value
    D.8 External controls heat demand
    D.9 Flow target temperature from external analogue regulator terminal
    D.10 Status internal heating pump error
    D,11 Status external heating pump error
    D.12 Cylinder charging pump via accessory module
    D.13 Hot water circulation pump
    D.22 Hot water demand
    D.23 Summer/Winter function
    D.25 Hot water activation via ebus control
    D.30 Control signal for both gas valves
    D.33 Fan speed target value
    D.34 Fan speed actual value
    D.36 Hot water flow sensor
    D.40 Flow temperature target value
    D.41 Return temperature actual value
    D.44 Digitised ionisation potential error
    D.47 Outside temperature with weather compensator – Vaillant controller only
    D.76 Remaining burner anti-cycling time in min
    D.90 Digital regulator status
    D.91 DCF status with connected external probe
    D.97 Activation of the second diagnostic level
    D.17 Heating glow return regulation
    D.18 Pump mode return
    D.19 Operating modes of the two speed heating pump
    D.20 Maximum set value for target cylinder
    D.27 Switching accessory relay 1
    D.28 Switching accessory relay 2
    D.50 Offset for minimum speed
    D.51 Offset for maximum speed
    D.58 Activation of solar reheating
    D.60 Number of safety temperature cut off
    D.61 Number of unsuccessful lockouts
    D.64 Average ignition times
    D.65 Maximum ignition time
    D.68 Unsuccessful ignitions in the first attempt
    D.69 Unsuccessful ignition for the second time
    D.70 Set diverter valve position
    D.71 Maximum setting of heater control knob
    D.72 Pump overrun time after warm start
    D.73 Off set for warm start target value
    D.75 Maximum charging time for a storage without own controller
    D.77 Limitation of cylinder charging in output in kW
    D.78 Limitation of cylinder charging temperature in c
    D.80 Operating hours heating
    D.81 Operating hours hot water generation
    D.82 Burner start up in heating mode
    D.83 Burner start up in hot water mode
    D.84 Maintenance indicator – number of hours until the next maintenance
    D.93 DSN appliance variant setting
    D.96 Factory setting
    Fault Code Possible Cause
    P.00 The heating circuit and hot water circuit are purged
    P.01 Maximum load test program error
    P.02 Minimum load test program
    P.06 Filling mode test program
    Fault Code Possible Cause
    D.0 Heating part load error
    D.1 Water pump overrun – time for heat mode
    D.2 Max burner anti-cycling period at 20c flow temperature
    D.3 Hot water flow temperature reading
    D.4 Current temperature for warm stat sensor
    D.5 Set value of flow temperature or target value of return
    D.7 Warm start temperature target value
    D.8 External controls heat demand
    D.9 Flow target temperature from external analogue regulator terminal
    D.10 Status internal heating pump error
    D,11 Status external heating pump error
    D.12 Cylinder charging pump via accessory module
    D.13 Hot water circulation pump
    D.15 Pump speed actual value
    D.22 Hot water demand
    D.23 Summer/Winter function
    D.24 Not relevant
    D.25 Hot water activation via eBus control
    D.30 Control signal for both gas valves
    D.33 Fan speed target value
    D.34 Fan speed actual value
    D.35 Not relevant
    D.40 Flow temperature target value
    D.41 Return temperature actual value
    D.44 Digitised ionisation – potential error
    D.47 Outside temperature with weather compensator – Vaillant controller only
    D.76 Remaining burner anti-cycling time in min
    D.90 Digital regulator status
    D.91 DCF status with connected external probe
    D.97 Activation of the second diagnostic level
    D.98 Telephone a heating engineer
    D.14 Pump speed target value
    D.17 Heating flow return regulation
    D.18 Pump operating mode
    D.20 Maximum set value for target cylinder
    D.26 Additional relay control ecoTec
    D.27 Switching accessory relay 1
    D.28 Switching accessory relay 2
    D.50 Offset for minimum speed
    D.51 Offset for maximum speed
    D.60 Number of safety temperature cut offs
    D.61 Number of unsuccessful lockouts
    D.64 Average ignition times
    D.65 Maximum ignition time
    D.67 Remaining burner anti-cycling time
    D.68 Unsuccessful ignitions in the first attempt
    D.69 Unsuccessful ignition for the second time
    D.70 Set diverter valve position
    D.71 Maximum setting of heater control knob
    D.72 Pump overrun time after warm start
    D.75 Maximum charging time for a storage without own controller
    D.77 Limitation of cylinder charging in output in kW
    D.78 Limitation of cylinder charging temperature in celsius
    D.80 Operating hours heating
    D.81 Operating hours hot water generation
    D.82 Burner start up in heating mode
    D.83 Burner start up in hot water mode
    D.84 Maintenance indicator – number of hours until the next maintenance
    D.93 DSN appliance variant setting
    D.96 Factory setting

    Worcester Boiler Error Codes

    Fault Description System Behaviour
    226 Service tool has been connected in the blocking error history menu
    FD 231 The power has been interrupted during a lockout
    C7 214 Fan does not run during the start up phase – fan harness connector needs checking
    C6 215 Fan speed too high – check the fan harness and connector
    C7 216 Fan speed too low – check the fan harness and connector
    C7 217 Fan has stopped during appliance operation
    C1 264 Fan stopped during operation
    C4 273 Continuous fan operation for the last 24 hours – appliance temporarily blocked
    E2 222 Flow temperature sensor shorted
    E2 233 Flow temperature sensor disconnected
    E9 276 Primary flow temperature exceeded 95°c
    E2 350 Flow temperature sensor shorted
    E2 351 Flow temperature sensor disconnected
    FA 306 Ionisation detected after the gas valve closed
    EA 227 No ionisation detected after ignition
    F7 228 Isioniation current detected before burner start
    EA 229 Loss of ionisation signal during operation
    EA 261 Heat control module (HCM) potentially defective – reset the appliance
    9U 233 Control box or heat control module (HCM) is defective or loose, the HCM needs to be checked
    C4 237 Control box or heat control module (HCM) is defective
    F0 238 Gas valve or control box error – gas valve coils need checking
    F0 239 Control box or the heat control module (HCM) is defective – the control box connections need checking
    F0 242 Control box or the heat control module (HCM) is defective – the HCM and control box connections need to be checked
    B7 257 Control box or the heat control module HCM) is defective- the HCM and control box connections need to be checked
    F0 258 Control box or the heat control module (HCM) is defective – HCM or control box connections need to be checked
    EH 258 Control box or the heat control module (HCM) is defective – HCM or control box connections need to be checked
    F1 259 Control box or the heat control module (HCM) is defective – HCM or control box connections need to be checked
    F0 262 Control box or the heat control module (HCM) is defective – HCM or control box connections need to be checked
    F1 263 Control box or the heat control module (HCM) is defective – HCM or control box connections need to be checked
    F0 272 Control box or the heat control module (HCM) is defective – control box and connections need checking or HCM might not be inserted properly and need replacing
    F0 280 Control box or the heat control module (HCM) is defective – control box and connections need checking or HCM might not be inserted properly and need replacing
    F0 290 Control box is defective – HCM needs checking as it might not be inserted properly or need replacing
    328 Internal error with the mains voltage – frequency may be inconsistent
    235 Incompatible heat control module (HCM) software versions – control box needs latest software
    356 Low mains voltage – the voltage may be interrupted or inconsistent and needs checking
    360 Heat control module (HCM) invalid – the inserted HCM does not correspond with the control box
    A8 362 Low mains voltage – the voltage may be interrupted, inconsistent or heat control module (HCM) invalid
    CC 800 Outdoor sensor defect available when accessory outdoor sensor is connected
    A1 281 Pump stock or running dry
    E9 224 Flue or high limit thermostat activated
    D4 341 Primary flow temperature rising too fast
    Fault Description System Behaviour
    208 The boiler is in chimney sweep mode
    200 The boiler is in heating mode
    201 The boiler is in domestic hot water (DHW) mode
    202 The boiler is waiting – there was a heat demand from the on off or modulating control
    203 The boiler is on standby
    204 The boiler is waiting – the actual temperature is higher than the calculated or selected boiler temperature
    212 The temperature recorded by the flow temperature sensor or the safety sensor is rising too quickly
    226 Diagnosis tool was connected and is now locked out
    260 The flow temperature sensor is not detecting a rise in temperature following a burner start
    265 The boiler is waiting in response to a heat demand – the boiler regularly switches to partial load
    268 Component test phase
    270 The boiler is modulating upwards
    283 The boiler is preparing for a burner start – the fan and pump are activated
    284 The gas valve is switched
    305 The boiler is waiting for domestic hot water (DHW) operation to end
    235 The KIM (boiler identification module) is too new for the burner control unit
    360 The KIM that has been fitted is not compatible with the burner control unit
    9A 361 The burner control unit that has been fitted is not compatible with the KIM (boiler identification module)
    9U 233 The burner control unit or KIM (boiler identification module) is faulty
    A3 317 Short circuit in the flue gas temperature sensor contacts
    B7 257 The burner control unit or the KIM (boiler identification module) is faulty
    C1 264 No control signal or power supply to the fan during operation
    C4 273 The boiler was switched off for a maximum of 2 minutes because it had been operating continuously for more than 24 hours
    C6 215 The fan speed is too high
    C6 216 The fan speed is too low
    C7 214 The fan does not run during the start phase
    C7 217 The fan speed is irregular when starting up
    CE 207 Water pressure is too low
    CE 266 Pump test failed
    D1 240 The contacts of the boiler return temperature sensor have been short circuited
    D1 241 The contacts of the boiler return temperature sensor have been interrupted
    D3 232 The external switching contact has opened
    D4 213 The actual temperature recorded by the flow temperature sensor or return temperature sensor is rising too quickly
    D4 271 Actual temperature differential between flow and safety temperature sensor is too high
    D4 286 The boiler return temperature sensor has detected a return temperature higher than 105°c
    E2 222 Short circuit in the flow temperature sensor contacts
    E2 223 The flow temperature sensor contacts have been interrupted
    E5 218 The temperature captured by the flow temperature sensor exceeded 105°c
    E9 210 The temperature measured by the flue gas sensor is too high and is open
    E9 219 The safety temperature sensor has captured a temperature in excess of 105°C
    E9 220 The contacts for the safety temperature sensor have shorted or the safety temperature sensor has detected a temperature higher than 130°c
    E9 224 The contacts of the safety temperature sensor have been interrupted
    E9 276 The temperature flow sensor has measured a temperature in excess of 95°c
    E9 277 The safety temperature sensor has measured temperature in excess of 95°c
    E9 285 The boiler return temperature sensor has measured a temperature higher than 95°c
    E9 318 The flue gas temperature sensor contacts have been interrupted
    EA 227 An insufficient ionisation current was measured following ignition of the burner
    EA 229 The ionisation current detected by the system during the burning phase was insufficient
    EA 234 The contacts of the gas valve have been interrupted
    EA 261 The burner control unit is faulty
    EA 269 The ignition device has been activated for too long
    F0 238 The burner control unit KIM (boiler identification module) is faulty
    F0 239 The burner control unit KIM (boiler identification module) has an error. Cabling might have poor contact breaks and pinching or the plug and wiring of the burner control unit needs checking, also check the operating characteristics of the boiler by replacing the burner control unit.
    F0 242, F0 243. F0 244. F0 245, F0 246. F0 247, F0 248, F0 249, F0 250, F0 251, F0 252, F0 253, F0 255, F0 259, F0 263, F0 267, F0 272 The burner control unit (KIM) is faulty – the wiring of the burner control unit needs checking, also check the operating characteristics of the boiler by replacing the burner control unit.
    F0 278 The sensor test has failed – cabling and plug sensors need checking
    F0 279 The burner control unit, or KIM, is faulty – control unit may need replacing
    F0 280 The burner control unit is faulty
    F0 287 The burner control unit, or KIM, has an error
    F0 290 The burner control unit, or KIM, is faulty
    F7 228 An ionisation current was measured before the burner started
    F7 328 A brief power failure has occurred
    FA 306 An ionisation current was measured after the burner went out
    FD 231 The mains voltage was interrupted during an interlocking fault
    EC 256 The burner control unit has an error
    EH 258 The burner control unit is faulty – check the plug and wiring of the burner control unit.
    H07 The current water pressure is too low, limiting the performance in heat mode as well as domestic hot water (DHW) mode
    HrE The boiler keeps resetting
    rE The boiler resets
    Fault Description System Behaviour
    Light off No boiler demand
    Light on Heating demand on boiler is OK
    1 flash 5 seconds off No ionisation detected after ignition
    2 flashes 5 seconds off Loss of ionisation signal during operation
    3 flashes 5 seconds off Gas valve error
    4 flashes 5 seconds off First safety timing error / ignition timing error
    5 flashes 5 seconds off Ionisation detected after burner stopped
    Gas valve EV2 leak test failed
    Gas valve EV1 leak test failed
    Ionisation current detected before burner start
    Gas valve error
    Ionisation sensor shorted
    4 flashes 5 second gap 1 long flash Sensor test failed
    4 flashes, 5 second gap, 2 long flashes Safety temperature too high
    4 flashes, 5 second gap, 3 long flashes Max safety thermostat activated
    4 flashes, 5 second gap, 4 long flashes Return temperature too high
    4 flashes, 5 second gap, 5 long flashes Flow temperature too high – supply sensor exceeded 110°c
    1 long flash, 4 quick flashes, 5 second gap, 1 long flash, 4 quick flashes Heating control module (HCM) defective
    2 long flashes, 4 quick flashes, 5 second gap, 2 long flashes, 4 quick flashes Fan running too fast
    Fan running too slow
    No airflow after defined period of time
    Fan not running
    3 long flashes, 4 quick flashes, 5 second gap, 3 long flashes, 4 quick flashes Mains voltage interrupted after locking error
    4 long flashes, 4 quick flashes, 5 second gap, 4 long flash, 4 quick flashes Internal control board faults
    5 long flashes, 4 quick flashes, 5 second gap, 5 long flash, 4 quick flashes All other miscellaneous faults – reset the boiler by turning the control knob anti-clockwise to the reset position
    Fault Description System Behaviour
    No light No power at control board
    Light on Appliance on but not operating during demand
    Slow flash ( mostly off flashes on) Ignition lockout
    Slow flash ( mostly on flashes off) Flue overheat or heat exchanger overheat
    Fast flash Volatile lockout sensor fan or code plug
    2 pulses Check service mode switch is in minimum position
    5 pulses Check service mode switch is in max position
    Fault Description System Behaviour
    200 O Boiler in heating mode
    201 O Boiler in hot water mode
    202 O Boiler in anti-cycle mode
    203 0 Boiler in standby – no heat energy demand
    204 O Current primary water temperature higher than set value
    208 0 Chimney sweep demand
    224 V Safety temperature limiter has tripped – top-up water until the reset pressure is reached
    227 V No flame signal after ignition burner control unit could need replacing
    228 V Flame signal without flame present – air/gas ratio control valve may need replacing as might the ionisation cable
    305 0 Boiler in hot water anti-cycle mode
    306 V Flame signal after closing the fuel supply – the air/gas ratio control valve might need replacing
    360 V Incompatible code plug – check if a correct code plug is installed and exchange or reconnect code plug
    815 W/B Low loss header temperature sensor faulty – check the sensor port or check the differential sensor for incorrect installation position or breakage
    1010 O No BUS communication cable, EMS-Bus isn’t connected or damaged – connect the cable for the EMS-Bus or replace the damaged cable exchange fuse
    1017 W Water pressure too low – the water needs topping up and the vent system or pressure sensor may need replacing
    1021 B Hot water temperature sensor is defective – the plug to the hot water temperature sensor may not be connected
    1022 B Hot water storage temperature sensor is defective – connect the plug to the hot water temperature sensor correctly, mount the hot water temperature sensor correctly or replace the hot water temperature sensor
    1037 W Outside temperature sensor is defective – check the connecting lead
    1065 B Pressure sensor defective or not connected – check pressure sensor connection as it may need replacing
    1068 W Outside temperature sensor defective – check the connecting lead
    1073 W Short circuit of the flow temperature sensor – the temperature sensor may need replacing
    1074 W No signal from the flow temperature sensor available – connect the plug to the flow temperature sensor correctly or temperature sensor could need replacing
    1075 W Short circuit of the temperature sensor at the heating block – temperature sensor may need replacing
    1076 W No signal from the temperature sensor at the heating block available – replace the temperature sensor, the connecting lead or the control unit
    2920 V Error with the flame monitoring
    2924 V No feedback from the modulating gas valve. The gas valve relay is defective – press the reset button and apply burner start, wait to see if fault reoccurs, if it does the gas valve needs replacing
    2925 V Feedback from the modulating gas valve is too low
    2927 B Flame failed during burner operation. Open the main shut off valve, shut down the appliance and check gas line, replace the ionisation electrode, set burner correctly and minimum rated load, check the integrity flue system and if the interconnected room air supply is too small, or the size of the ventilation opening is too small, clean the heating block on the flue gas side or replace the control unit/burner control unit
    2946 V Incorrect code plug detected – the code plug needs replacing
    2948 B No flame signal. With low output the burner starts automatically after cleaning. If the fault occurs repeatedly, the setting of the CO2 valves need checking
    2950 B No flame signal. Following starting procedure the burner starts automatically. After cleaning set the correct gas / air ratio correctly
    2963 B Signal from flow and heat exchanger temperature sensor outside the permissible range – the connecting lead needs connecting correctly
    2964 B Flow rate in heat exchanger is too low
    2965 B Flow temperature too high
    2966 B Flow temperature rise in heat exchanger too rapid
    2967 B Flow / heat exchanger temperature sensor differential too great
    2970 B Pressure drop in heating system too rapid
    2971 B System pressure too low – the heating system needs venting or water needs topping up until the preset pressure is reached. Replace the cable to the pressure sensor replace the pressure sensor

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