F.61
Vaillant
Gas Valve Control Fault
F.61 error, boiler does not attempt ignition, gas valve not actuated
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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
Defective gas valve, Short or open circuit in gas valve wiring, PCB gas valve driver failure, Incorrect polarity or earthing
How to Fix / Troubleshooting
Safety: Turn off gas and power. Gas valve faults must be handled by qualified personnel.
Checks (technician):
- Verify correct mains polarity and earth at the boiler terminals.
- Inspect gas valve connector and harness for damage.
- Measure gas valve coil resistance; replace gas valve if out of spec.
- Check for correct voltage at the gas valve during ignition demand.
If the gas valve and wiring are sound but F.61 persists, the PCB is likely faulty and should be replaced by a professional.
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Repair Difficulty
Professional Required
5/5
Required Part
Gas Valve Assembly
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