F14
Saunier Duval
Gas Valve Control Fault
Furnace shows F14, burner does not start, may be associated with gas valve control
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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
Open circuit or shorted gas valve coil,Loose gas valve connector,Incorrect gas valve wiring after service,Defective control board gas valve driver
How to Fix / Troubleshooting
Critical safety warning: Only licensed gas technicians may work on gas valves and associated wiring. Do not attempt DIY repairs on gas components.
- Visual check: With power off, inspect the gas valve connector and wiring harness for damage, loose plugs, or signs of overheating.
- Coil resistance test (qualified): A technician can measure the resistance of the gas valve coils and compare with Saunier Duval specifications. An open or shorted coil requires gas valve replacement.
- Check polarity and earthing: Incorrect mains polarity or poor earth can affect gas valve operation. An electrician should verify correct supply wiring.
- PCB output test: Using appropriate test equipment, a technician can confirm whether the PCB is sending the correct voltage to the gas valve during ignition. Lack of output indicates a faulty PCB.
- Replace components as needed: Replace the gas valve or main PCB only with genuine Saunier Duval parts and perform full combustion checks after replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
Gas Valve Assembly
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