F.62
Vaillant
Gas Valve Shut-off Delay / Gas Valve Sticking
F.62 displayed, boiler may click repeatedly, delayed ignition or no ignition
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Gas valve not closing properly, Contaminated gas valve, PCB timing/control fault, Incorrect gas valve adjustment
How to Fix / Troubleshooting
Safety: Potentially dangerous gas valve behaviour. Turn off gas and power and do not use the boiler.
Action:
- Contact a Gas Safe registered engineer immediately.
- The engineer should test the gas valve for correct closing, replace the valve if sticking, and verify safe operation with a combustion test.
- If the valve is new and correctly installed, the PCB may require replacement.
Do not attempt to free or adjust the gas valve yourself.
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Repair Difficulty
Professional Required
5/5
Required Part
Gas Valve Assembly
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