Encountering the F22 fault code on your Vaillant boiler indicates a low water pressure issue within the system. This safety feature prevents the boiler from operating to avoid potential damage. Understanding the causes and solutions can help restore your heating system efficiently.
The F22 fault code signifies that the boiler’s water pressure has dropped below a safe level, typically around 0.5 bar. This low pressure prevents the boiler from functioning correctly, affecting both heating and hot water supply.
Several factors can lead to the F22 fault code:
Leaks in the System: Leaks can cause a consistent drop in boiler pressure, leading to the F22 fault code.
Trapped Air: Air pockets within the system can disrupt water circulation, causing pressure imbalances.
Faulty Pressure Sensor: A malfunctioning sensor may inaccurately detect pressure levels, triggering the fault code.
Damaged Expansion Vessel: Issues with the expansion vessel can lead to pressure fluctuations.
Recently Bled Radiators: Bleeding radiators without repressurising the system can result in low pressure.
Check for Visible Leaks
Inspect radiators, pipes, and boiler components for any signs of leakage. Addressing leaks promptly can prevent pressure loss.
2. Repressurise the Boiler
If no leaks are found, the system may need repressurising:
Locate the Filling Loop: Typically found beneath the boiler, consisting of two valves and a silver braided hose.
Open the Valves: Slowly open both valves to allow water into the system.
Monitor the Pressure Gauge: Watch the gauge until it reaches approximately 1.5 bar.
Close the Valves: Once at the correct pressure, close both valves securely.
For detailed instructions check the video above.
3. Reset the Boiler
After repressurising, reset the boiler to clear the fault code. Consult the user manual for specific reset procedures.
4. Seek Professional Assistance
If the fault persists after these steps, contact a qualified engineer for a thorough inspection and necessary repairs.
Regular Maintenance: Schedule annual boiler servicing to ensure all components function correctly.
Monitor System Pressure: Regularly check the pressure gauge to detect and address drops promptly.
Bleed Radiators Carefully: After bleeding radiators, always check and adjust the system pressure.
Persistent F22 faults may indicate underlying issues requiring expert attention. Engaging in boiler repairs or new boiler installations should always be handled by certified professionals to ensure safety and compliance with regulations.
For homeowners experiencing frequent boiler issues, why not get expert advice from the Master Gas team? Regular boiler servicing will help avoid or detect issues before the boiler breaks down. Why not take out a boiler cover home care plan? This can lower your costs on aging boilers by providing an annual service every year and repairs at a much lower price.
08/01/24
Tam and his team, great price, great installation , clean tidy, great after care. Most of all Nice people. Vaillant Ecotec Plus. Rad installed.In the words of Tina Turner “simply the best”
05/01/24
Installed a new boiler for us in 2022. New Year’s Eve 2023 we had an unrelated problem with our Co2 alarm, Ed called me, then came round to check everything was fine – fantastic service and we were so grateful!
12/11/23
We had a boiler replaced. The team were amazing from quotation to installation. The new boiler was installed in a day. The house was left tidier than when they arrived. Highly recommended.
03/01/24
19/10/23
Referred to this amazing company Master Gas London as l needed to replace an old boiler. I contacted them, in a couple of days, surveyed, detailed quote with recommendations, and installation arranged.
21/12/23
New boiler, replacement of leaking underfloor heating manifold, rerouting overflow pipe, improved piping in cellar – all completed to a high standard in one day. Thanks!
18/11/23
Highly recommend Master Gas for any boiler issues. They came and fitted a new boiler quickly and at a fair price & were a pleasure to have in the house. Highly recommend.
