F61
Viessmann
Gas Valve Control Fault
Boiler locks out with F61, gas valve error indicated
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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, incorrect wiring, defective PCB gas valve driver, internal gas valve fault
How to Fix / Troubleshooting
Safety: Gas valve faults must be handled by qualified personnel only.
- Do not tamper with gas valve: Do not attempt to open or adjust the valve.
- Visual inspection: Check the gas valve connector and cable for damage or signs of overheating.
- Technician diagnostics: A professional should measure coil resistance, check for shorts to earth, and test PCB outputs.
- Replace components: Replace the gas valve and/or PCB as indicated by diagnostic tests, then recommission with combustion analysis.
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Repair Difficulty
Professional Required
5/5
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