Tag: Vaillant Boiler Repair

Vaillant Boiler Repairs London
Boiler Repair, Vaillant

Vaillant Boiler Repair London

Expert Vaillant Boiler Repair London

Having a damaged Vaillantbroker automatically means no more hot water or heating in your home. How do you expect to cope with that? Of course, you can’t! Are you going through such in your home? If yes, then what you need right now is a Vaillant repair.

Looking for where to get the best? We have that just right here. Valliant Boiler Repair London offers the best of Vaillant repairs all across the magnificent city of London. With many years of experience taking care of gas and water heating system, we count ourself as one of the fore frontiers in the business.

Over the years, we have been able to groom specialists who are experienced, flexible and knowledgeable in Vaillant repairs. This makes us the best option you have if you truly want to make your Vaillant boiler function optimally and remain at their best for a long period.

Vaillant Repairs London

Safety is of paramount importance in our Vaillant repairs. Which is why we adhere strictly to health and safety regulations without any form of filter. This habit has earned several accreditations from recognized bodies such as the National Inspection Council for Electrical Installation Contractors and Gas Safe,  the Institute of Plumbing and Heating Engineers, and many more. With this in place, you should be assured that you are getting nothing but the best from us.

Why Choose Vaillant Boiler Repair London

  • Highly Experienced Personnels – When it comes quality, we have the best of it all. Our engineers are experienced, accredited and fully equipped with the needed tools to carry out any kind of Vaillant repairs. More so, they are very quick with diagnosis and finding the right solution to your Vaillant boilers.
  • Wide Network – What makes a Vaillant boiler repair company stand out is their accessibility when needed. Vaillant boiler repair London has this just in place. We have a wide network that is available 24/7. Our engineers will be right at your doorsteps immediately you reach out to them.
  • Affordable Price – Getting our services doesn’t mean you have to rob a bank. We offer Vaillant boiler repair at affordable prices. Moreover, we usually send our quotes upfront before going ahead with repair to aid transparency. We don’t include additional cost after the job, neither do we have hidden charges.

With all that is been shared above, we are sure you will look no further, as you have found the perfect Vaillant repair company to help with your Vaillant repairs. We just a call away.

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
07948 009 319

 

Boiler Replacement London

Vaillant Boiler Error Codes

Fault CodePossible CauseMeaning
F.00NTC FaultsThis means that your Flow NTC (Negative Temperature Coefficient Thermistor) cable is either defective or broken and needs to be replaced
F.01The Flow NTC (Negative Temperature Coefficient Thermistor) cable is either defective or broken and needs to be replaced
F.10
F.11
F.13
F.20Boiler has exceeded the maximum temperature and needs to cool down
F.22Dry fire / Low water in system / OverheatThis means that there’s either no water in your system, you have a defective pump or the pump lead is defective
F.24Low water / Pump Failure / BlockagePump could be obstructed, running at low capacity, could be air trapped or the pressure might be too low.
F.28Either insufficient gas in the system, a defective electrode, ignition lead or electronic ignitor
F.29Flame extinguishedFlame or pilot light has gone out – check flue duct or gas supply.
F.60Gas valve control defectiveCable loom (connects gas valve) might have short circuited, gas valve assembly defective or electronic control system issue.
F.61Gas valve control defectiveCable loom (connects gas valve) might have short circuited, gas valve assembly defective or electronic control system issue.
F.62Defective gas valve closure mechanismBoiler has exceeded the maximum temperature and needs to cool down
F.63EEPROM (Electrically Erasable Programmable Read-Only Memory) errorElectronic fault.
F.64Electronic system or sensor faultFlow or back flow NTC has short circuited, or an electronic fault
F.65Electronic system temperature too highThis can happen because of an external heat source or an electrical fault
F.67Electronic fault in the flame system
Fault CodePossible Cause
F.1Lack of gas, a fault with the ignition or flue – may need to adjust the gas valve or replace a defective electrode lead.
F.4Ignition fault.
F.5The system has suffered a fault due to overheating.
F.6Your flow NTC has developed a fault.
F.17Check the polarity of your system.
F.24Pump-related faults – the pump could have failed, it may have over run or there could be an issue with the airlock
Fault CodePossible Cause
F.00, .04, .05, .10, .14, .15All of these are NTC faults, and are best resolved by first changing all NTC to make diagnosis earlier.
F.21The pilot flame has failed.
F.22There is insufficient water in your system.
F.11A blockage in the appliance is preventing the system from flowing as it should.
F.12A blockage in the appliance is affecting the system’s pressure.
F.13The appliance is blocked because of a water deficiency.
Fault CodePossible Cause
S.OHeating issue, no heat demand
S.1Fan start-up error
S.2Pump flow error
S.3Heating mode error – ignition problem
S.4Heat mode – burner on error
S.6Heating mode – fan overrun error
S.7Heating mode – pump overrun error
S.8Heating remaining cut off for XX amount of time
S.31No heat demand summer operating mode
S.34Heating mode frost protection error
S.20Hot water requirement error
S.22Hot water handling pump flow error
S.24Hot water operation burner is on
S.85Service message quantity of circulation water
Fault CodePossible Cause
F.00 / F.0Flow temperature sensor interruption
F.01 / F.1Return temperature sensor interruption
F.10Flow NTC short circuit
F.11Return NTC short circuit
F.20Safety switch off temperature limiter
F.22Safety switch off low water pressure
F.23Safety switch off temperature difference too great
F.24Safety switch off temperature is rising to fast
F.25Safety switch off flue gas temperature too high
F.26Error with gas valve – possible no function
F.27Safety switch off flame simulation
F.28Failure during start up – ignition unsuccessful to start
F.29Failure during operation – re-ignition unsuccessful
F.32Fan error
F.49eBUS error – possible short circuit
F.61Error with gas valve regulation
F.62Error with gas valve – switch off delay
F.63EEPROM error
F.64Electronics / NTC error
F.65Electronic temperature error could be overheating due to external influences
F.67Electronics flame signal error
F.68Unstable flame signal error air in gas
F.70Invalid device specific number (DSN)
F.71Flow NTC error – flow temperature sensor signal constant value
F.72Flow return NTC error – temperature difference too great
F.73Water pressure sensor signal in the wrong range, it is too low
F.74Water pressure sensor signal outside correct range, the sensor signal is too high
F.75Error with pressure – no pressure change detection when starting the pump
F.76Overheating protection on – primary heat exchanger has responded
F.77Flue non return flap condensate pump error
F.78Interruption to DHW outlet sensor at external controller
F.83Flow and or return temperature sensor error
F.84Error with flow/return temperature sensor temperature changing error
F.85Error with flow and return temperature, sensor incorrectly fitted
CONNECTIONNo communication with the PCB
Fault CodePossible Cause
S.00Heating mode error – no heat demand
S.01Heating mode fan start-up
S.02Heating mode error – water pump running
S.03Heating mode – ignition sequence error
S.04Heating mode – burner ignited
S.06Heating mode – fan overrun error
S.07Heating mode – pump overrun error
S.08Heating remaining cut off time xx minutes
S.10Hot water demand via impeller sensor
S.11DHW mode fan start up error
S13DHW mode ignition error
S.14Hot water demand via fan sensor error
S.15DHW mode pump and fan overrun
S.16DHW mode – fan overrun error
S.17DHW mode – pump overrun error
S.20DHW mode – burner on error
S.21DHW mode – fan start up error
S.22DHW demand – error pump running
S.23DHW ignition error
S.24DHW mode – burner error
S.25DHW mode – pump or fan overrun error
S.26DHW mode – fan overrun
S.27DHW mode – pump overrun
S.28Hot water burner anti-cycling time
S.30Room thermostat is blocking heating mode
S.31No heat demand boiler in summer operating mode
S.32Waiting period because of fan speed deviation
S.34Heating mode frost protection error
S.39Burner off contact has been triggered this could be because of contact thermostat or condensate pump
S.40Comfort safety mode active
S.41Water pressure > 2.8 bar
S.42Flue non return flap return signal blocks burner operation
S.46Comfort safety mode flame loss at minimum load
S.53Boiler is in waiting period of modulation f block function due to water shortage
S.54Boiler is in waiting period of operation, blocking function as a result
S.57Waiting period comfort safety mode
S.58Modulation limitation due to noise / wind error
S.61Gas family check unsuccessful
Fault CodePossible Cause
S.20Warnstar demand
S.21Fan running
S.22Pump running
S.23Ignition sequence
S.24Burner ignited
S.25Fan and water pump running
S.26Fan overrun
S.27Pump overrun
S.28Anti-cycling mode
S.30No heating demand from external controls
S.31Central heating thermostat knob turned off
S.32Heat exchanger antifreeze active as fan speed variation is too high
S.34Anti-frost mode is active
S.36Not heating demand form low voltage
S.41Water pressure greater than 2.9 bar
S.42Response from accessory module or defective condensate pump is blocking burner operation
S.53Appliance is within the waiting period of the block operation function due to water shortage
S.54Appliance is within the waiting period of the block operation due to water shortage
S.96Return sensor error
S.98Flow return sensor check is running demand is block
D.0Heating part load error
D.1Water pump overrun – time for heat mode
D.2Max burner anti-cycling period at 20c flow temperature
D.3Hot water flow temperature reading
D.4Current temperature for warm stat sensor
D.7Warm start temperature target value
D.8External controls heat demand
D.9Flow target temperature from external analogue regulator terminal
D.10Status internal heating pump error
D,11Status external heating pump error
D.12Cylinder charging pump via accessory module
D.13Hot water circulation pump
D.22Hot water demand
D.23Summer/Winter function
D.25Hot water activation via ebus control
D.30Control signal for both gas valves
D.33Fan speed target value
D.34Fan speed actual value
D.36Hot water flow sensor
D.40Flow temperature target value
D.41Return temperature actual value
D.44Digitised ionisation potential error
D.47Outside temperature with weather compensator – Vaillant controller only
D.76Remaining burner anti-cycling time in min
D.90Digital regulator status
D.91DCF status with connected external probe
D.97Activation of the second diagnostic level
D.17Heating glow return regulation
D.18Pump mode return
D.19Operating modes of the two speed heating pump
D.20Maximum set value for target cylinder
D.27Switching accessory relay 1
D.28Switching accessory relay 2
D.50Offset for minimum speed
D.51Offset for maximum speed
D.58Activation of solar reheating
D.60Number of safety temperature cut off
D.61Number of unsuccessful lockouts
D.64Average ignition times
D.65Maximum ignition time
D.68Unsuccessful ignitions in the first attempt
D.69Unsuccessful ignition for the second time
D.70Set diverter valve position
D.71Maximum setting of heater control knob
D.72Pump overrun time after warm start
D.73Off set for warm start target value
D.75Maximum charging time for a storage without own controller
D.77Limitation of cylinder charging in output in kW
D.78Limitation of cylinder charging temperature in c
D.80Operating hours heating
D.81Operating hours hot water generation
D.82Burner start up in heating mode
D.83Burner start up in hot water mode
D.84Maintenance indicator – number of hours until the next maintenance
D.93DSN appliance variant setting
D.96Factory setting
Fault CodePossible Cause
P.00The heating circuit and hot water circuit are purged
P.01Maximum load test program error
P.02Minimum load test program
P.06Filling mode test program
Fault CodePossible Cause
D.0Heating part load error
D.1Water pump overrun – time for heat mode
D.2Max burner anti-cycling period at 20c flow temperature
D.3Hot water flow temperature reading
D.4Current temperature for warm stat sensor
D.5Set value of flow temperature or target value of return
D.7Warm start temperature target value
D.8External controls heat demand
D.9Flow target temperature from external analogue regulator terminal
D.10Status internal heating pump error
D,11Status external heating pump error
D.12Cylinder charging pump via accessory module
D.13Hot water circulation pump
D.15Pump speed actual value
D.22Hot water demand
D.23Summer/Winter function
D.24Not relevant
D.25Hot water activation via eBus control
D.30Control signal for both gas valves
D.33Fan speed target value
D.34Fan speed actual value
D.35Not relevant
D.40Flow temperature target value
D.41Return temperature actual value
D.44Digitised ionisation – potential error
D.47Outside temperature with weather compensator – Vaillant controller only
D.76Remaining burner anti-cycling time in min
D.90Digital regulator status
D.91DCF status with connected external probe
D.97Activation of the second diagnostic level
D.98Telephone a heating engineer
D.14Pump speed target value
D.17Heating flow return regulation
D.18Pump operating mode
D.20Maximum set value for target cylinder
D.26Additional relay control ecoTec
D.27Switching accessory relay 1
D.28Switching accessory relay 2
D.50Offset for minimum speed
D.51Offset for maximum speed
D.60Number of safety temperature cut offs
D.61Number of unsuccessful lockouts
D.64Average ignition times
D.65Maximum ignition time
D.67Remaining burner anti-cycling time
D.68Unsuccessful ignitions in the first attempt
D.69Unsuccessful ignition for the second time
D.70Set diverter valve position
D.71Maximum setting of heater control knob
D.72Pump overrun time after warm start
D.75Maximum charging time for a storage without own controller
D.77Limitation of cylinder charging in output in kW
D.78Limitation of cylinder charging temperature in celsius
D.80Operating hours heating
D.81Operating hours hot water generation
D.82Burner start up in heating mode
D.83Burner start up in hot water mode
D.84Maintenance indicator – number of hours until the next maintenance
D.93DSN appliance variant setting
D.96Factory setting
Vaillant Boiler Repairs London
Boiler Repair, Vaillant

Boiler Replacement London

Boiler Replacement London

Do you need a gas boiler replacement and you don’t know how to go about it? Perhaps, you want a company that can help you with the replacement at an affordable cost? We can help you with the replacement of our gas boiler within a very timely manner.

When it comes to carrying out a gas boiler replacement in your home, you can’t afford to let an unprofessional do this for you. Just a single mistake could cause more damage and cost you a lot more than you were trying to save in the first place. We are sure you don’t want such and thought of not making such mistake has brought you here.

Expert Gas Boiler Replacements London

As professionals that deals with Gas boiler replacements, we know exactly what you need and how you want it done. Our experiences with our countless previous clients give us insight as to the way and manner you want this replacement to be done. Our engineers are registered gas engineers with full qualifications on installations and repairs. Unlike others, we are not restricted to just a single boiler brand. We have the full accreditation to install Worcester Bosch boiler, Viessmann, and Vaillant boilers. Despite, we are completely independent. Which means you will be getting the best advice from us as to which brand to go for to cater for your gas boiler replacement needs.

In addition to helping with your gas boiler replacement, we will take a step further by helping you to register the replacement of the gas boiler with Gas Safe Register. You will be issued a certificate for this and this will serve as your insurance.

Thinking of how long it might take us to finish with your gas boiler replacement? We are very time-sensitive, but this usually takes about 2-3 days to finish up. However, this time is directly related to the present state of your central heating system and also the type and brand of the boiler to be installed.

Moreover, hiring us to help with your gas boiler replacement will give you the exclusive opportunity to get advice from or professionals on how to maintain your newly replaced gas boiler.

WHY CHOOSE US?

  • You will be entitled to excellent customer care that is ready to satisfy you always
  • A competitive price that will suit your budget.
  • Guaranteed insurance that protects you

No form of hidden charges or after work cost.

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
07948 009 319

 

Boiler Replacement London

Vaillant Boiler Error Codes

Fault CodePossible CauseMeaning
F.00NTC FaultsThis means that your Flow NTC (Negative Temperature Coefficient Thermistor) cable is either defective or broken and needs to be replaced
F.01The Flow NTC (Negative Temperature Coefficient Thermistor) cable is either defective or broken and needs to be replaced
F.10
F.11
F.13
F.20Boiler has exceeded the maximum temperature and needs to cool down
F.22Dry fire / Low water in system / OverheatThis means that there’s either no water in your system, you have a defective pump or the pump lead is defective
F.24Low water / Pump Failure / BlockagePump could be obstructed, running at low capacity, could be air trapped or the pressure might be too low.
F.28Either insufficient gas in the system, a defective electrode, ignition lead or electronic ignitor
F.29Flame extinguishedFlame or pilot light has gone out – check flue duct or gas supply.
F.60Gas valve control defectiveCable loom (connects gas valve) might have short circuited, gas valve assembly defective or electronic control system issue.
F.61Gas valve control defectiveCable loom (connects gas valve) might have short circuited, gas valve assembly defective or electronic control system issue.
F.62Defective gas valve closure mechanismBoiler has exceeded the maximum temperature and needs to cool down
F.63EEPROM (Electrically Erasable Programmable Read-Only Memory) errorElectronic fault.
F.64Electronic system or sensor faultFlow or back flow NTC has short circuited, or an electronic fault
F.65Electronic system temperature too highThis can happen because of an external heat source or an electrical fault
F.67Electronic fault in the flame system
Fault CodePossible Cause
F.1Lack of gas, a fault with the ignition or flue – may need to adjust the gas valve or replace a defective electrode lead.
F.4Ignition fault.
F.5The system has suffered a fault due to overheating.
F.6Your flow NTC has developed a fault.
F.17Check the polarity of your system.
F.24Pump-related faults – the pump could have failed, it may have over run or there could be an issue with the airlock
Fault CodePossible Cause
F.00, .04, .05, .10, .14, .15All of these are NTC faults, and are best resolved by first changing all NTC to make diagnosis earlier.
F.21The pilot flame has failed.
F.22There is insufficient water in your system.
F.11A blockage in the appliance is preventing the system from flowing as it should.
F.12A blockage in the appliance is affecting the system’s pressure.
F.13The appliance is blocked because of a water deficiency.
Fault CodePossible Cause
S.OHeating issue, no heat demand
S.1Fan start-up error
S.2Pump flow error
S.3Heating mode error – ignition problem
S.4Heat mode – burner on error
S.6Heating mode – fan overrun error
S.7Heating mode – pump overrun error
S.8Heating remaining cut off for XX amount of time
S.31No heat demand summer operating mode
S.34Heating mode frost protection error
S.20Hot water requirement error
S.22Hot water handling pump flow error
S.24Hot water operation burner is on
S.85Service message quantity of circulation water
Fault CodePossible Cause
F.00 / F.0Flow temperature sensor interruption
F.01 / F.1Return temperature sensor interruption
F.10Flow NTC short circuit
F.11Return NTC short circuit
F.20Safety switch off temperature limiter
F.22Safety switch off low water pressure
F.23Safety switch off temperature difference too great
F.24Safety switch off temperature is rising to fast
F.25Safety switch off flue gas temperature too high
F.26Error with gas valve – possible no function
F.27Safety switch off flame simulation
F.28Failure during start up – ignition unsuccessful to start
F.29Failure during operation – re-ignition unsuccessful
F.32Fan error
F.49eBUS error – possible short circuit
F.61Error with gas valve regulation
F.62Error with gas valve – switch off delay
F.63EEPROM error
F.64Electronics / NTC error
F.65Electronic temperature error could be overheating due to external influences
F.67Electronics flame signal error
F.68Unstable flame signal error air in gas
F.70Invalid device specific number (DSN)
F.71Flow NTC error – flow temperature sensor signal constant value
F.72Flow return NTC error – temperature difference too great
F.73Water pressure sensor signal in the wrong range, it is too low
F.74Water pressure sensor signal outside correct range, the sensor signal is too high
F.75Error with pressure – no pressure change detection when starting the pump
F.76Overheating protection on – primary heat exchanger has responded
F.77Flue non return flap condensate pump error
F.78Interruption to DHW outlet sensor at external controller
F.83Flow and or return temperature sensor error
F.84Error with flow/return temperature sensor temperature changing error
F.85Error with flow and return temperature, sensor incorrectly fitted
CONNECTIONNo communication with the PCB
Fault CodePossible Cause
S.00Heating mode error – no heat demand
S.01Heating mode fan start-up
S.02Heating mode error – water pump running
S.03Heating mode – ignition sequence error
S.04Heating mode – burner ignited
S.06Heating mode – fan overrun error
S.07Heating mode – pump overrun error
S.08Heating remaining cut off time xx minutes
S.10Hot water demand via impeller sensor
S.11DHW mode fan start up error
S13DHW mode ignition error
S.14Hot water demand via fan sensor error
S.15DHW mode pump and fan overrun
S.16DHW mode – fan overrun error
S.17DHW mode – pump overrun error
S.20DHW mode – burner on error
S.21DHW mode – fan start up error
S.22DHW demand – error pump running
S.23DHW ignition error
S.24DHW mode – burner error
S.25DHW mode – pump or fan overrun error
S.26DHW mode – fan overrun
S.27DHW mode – pump overrun
S.28Hot water burner anti-cycling time
S.30Room thermostat is blocking heating mode
S.31No heat demand boiler in summer operating mode
S.32Waiting period because of fan speed deviation
S.34Heating mode frost protection error
S.39Burner off contact has been triggered this could be because of contact thermostat or condensate pump
S.40Comfort safety mode active
S.41Water pressure > 2.8 bar
S.42Flue non return flap return signal blocks burner operation
S.46Comfort safety mode flame loss at minimum load
S.53Boiler is in waiting period of modulation f block function due to water shortage
S.54Boiler is in waiting period of operation, blocking function as a result
S.57Waiting period comfort safety mode
S.58Modulation limitation due to noise / wind error
S.61Gas family check unsuccessful
Fault CodePossible Cause
S.20Warnstar demand
S.21Fan running
S.22Pump running
S.23Ignition sequence
S.24Burner ignited
S.25Fan and water pump running
S.26Fan overrun
S.27Pump overrun
S.28Anti-cycling mode
S.30No heating demand from external controls
S.31Central heating thermostat knob turned off
S.32Heat exchanger antifreeze active as fan speed variation is too high
S.34Anti-frost mode is active
S.36Not heating demand form low voltage
S.41Water pressure greater than 2.9 bar
S.42Response from accessory module or defective condensate pump is blocking burner operation
S.53Appliance is within the waiting period of the block operation function due to water shortage
S.54Appliance is within the waiting period of the block operation due to water shortage
S.96Return sensor error
S.98Flow return sensor check is running demand is block
D.0Heating part load error
D.1Water pump overrun – time for heat mode
D.2Max burner anti-cycling period at 20c flow temperature
D.3Hot water flow temperature reading
D.4Current temperature for warm stat sensor
D.7Warm start temperature target value
D.8External controls heat demand
D.9Flow target temperature from external analogue regulator terminal
D.10Status internal heating pump error
D,11Status external heating pump error
D.12Cylinder charging pump via accessory module
D.13Hot water circulation pump
D.22Hot water demand
D.23Summer/Winter function
D.25Hot water activation via ebus control
D.30Control signal for both gas valves
D.33Fan speed target value
D.34Fan speed actual value
D.36Hot water flow sensor
D.40Flow temperature target value
D.41Return temperature actual value
D.44Digitised ionisation potential error
D.47Outside temperature with weather compensator – Vaillant controller only
D.76Remaining burner anti-cycling time in min
D.90Digital regulator status
D.91DCF status with connected external probe
D.97Activation of the second diagnostic level
D.17Heating glow return regulation
D.18Pump mode return
D.19Operating modes of the two speed heating pump
D.20Maximum set value for target cylinder
D.27Switching accessory relay 1
D.28Switching accessory relay 2
D.50Offset for minimum speed
D.51Offset for maximum speed
D.58Activation of solar reheating
D.60Number of safety temperature cut off
D.61Number of unsuccessful lockouts
D.64Average ignition times
D.65Maximum ignition time
D.68Unsuccessful ignitions in the first attempt
D.69Unsuccessful ignition for the second time
D.70Set diverter valve position
D.71Maximum setting of heater control knob
D.72Pump overrun time after warm start
D.73Off set for warm start target value
D.75Maximum charging time for a storage without own controller
D.77Limitation of cylinder charging in output in kW
D.78Limitation of cylinder charging temperature in c
D.80Operating hours heating
D.81Operating hours hot water generation
D.82Burner start up in heating mode
D.83Burner start up in hot water mode
D.84Maintenance indicator – number of hours until the next maintenance
D.93DSN appliance variant setting
D.96Factory setting
Fault CodePossible Cause
P.00The heating circuit and hot water circuit are purged
P.01Maximum load test program error
P.02Minimum load test program
P.06Filling mode test program
Fault CodePossible Cause
D.0Heating part load error
D.1Water pump overrun – time for heat mode
D.2Max burner anti-cycling period at 20c flow temperature
D.3Hot water flow temperature reading
D.4Current temperature for warm stat sensor
D.5Set value of flow temperature or target value of return
D.7Warm start temperature target value
D.8External controls heat demand
D.9Flow target temperature from external analogue regulator terminal
D.10Status internal heating pump error
D,11Status external heating pump error
D.12Cylinder charging pump via accessory module
D.13Hot water circulation pump
D.15Pump speed actual value
D.22Hot water demand
D.23Summer/Winter function
D.24Not relevant
D.25Hot water activation via eBus control
D.30Control signal for both gas valves
D.33Fan speed target value
D.34Fan speed actual value
D.35Not relevant
D.40Flow temperature target value
D.41Return temperature actual value
D.44Digitised ionisation – potential error
D.47Outside temperature with weather compensator – Vaillant controller only
D.76Remaining burner anti-cycling time in min
D.90Digital regulator status
D.91DCF status with connected external probe
D.97Activation of the second diagnostic level
D.98Telephone a heating engineer
D.14Pump speed target value
D.17Heating flow return regulation
D.18Pump operating mode
D.20Maximum set value for target cylinder
D.26Additional relay control ecoTec
D.27Switching accessory relay 1
D.28Switching accessory relay 2
D.50Offset for minimum speed
D.51Offset for maximum speed
D.60Number of safety temperature cut offs
D.61Number of unsuccessful lockouts
D.64Average ignition times
D.65Maximum ignition time
D.67Remaining burner anti-cycling time
D.68Unsuccessful ignitions in the first attempt
D.69Unsuccessful ignition for the second time
D.70Set diverter valve position
D.71Maximum setting of heater control knob
D.72Pump overrun time after warm start
D.75Maximum charging time for a storage without own controller
D.77Limitation of cylinder charging in output in kW
D.78Limitation of cylinder charging temperature in celsius
D.80Operating hours heating
D.81Operating hours hot water generation
D.82Burner start up in heating mode
D.83Burner start up in hot water mode
D.84Maintenance indicator – number of hours until the next maintenance
D.93DSN appliance variant setting
D.96Factory setting
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