F61
Glow-worm
Gas Valve Electrical Fault
Boiler shows F61, gas valve error, 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
Short or open circuit in gas valve coil, Damaged wiring harness, PCB output fault, Incorrect gas valve fitted
How to Fix / Troubleshooting
Safety: Isolate gas and power before any work on gas components. Only Gas Safe engineers may test or replace gas valves.
- Reset once: Try a single reset. If F61 returns immediately, internal diagnostics are required.
- Engineer tasks:
- Measure gas valve coil resistance.
- Inspect wiring and connectors between gas valve and PCB.
- Test PCB gas valve driver circuit.
- Replace gas valve and/or PCB as indicated.
Do not attempt DIY repairs on gas valves.
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Repair Difficulty
Professional Required
5/5
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