F62
Glow-worm
Gas Valve Closure Fault
Boiler displays F62, gas valve closing delay or sticking
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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
Sticking gas valve mechanism, Contaminated gas valve, PCB control timing fault, Incorrect gas valve type
How to Fix / Troubleshooting
Safety: Immediately isolate gas and power if F62 occurs. This is a safety-critical fault.
- Do not reset repeatedly: Continuous resetting may be unsafe if the gas valve is not closing correctly.
- Engineer tasks:
- Test gas valve operation and closing time.
- Inspect for contamination or mechanical sticking.
- Replace the gas valve and check PCB control signals.
This fault must be addressed urgently by a Gas Safe engineer.
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Repair Difficulty
Professional Required
5/5
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