E14
Thermona
Gas Valve Control Fault
Boiler shows E14, no ignition, often after power disturbances or wiring work.
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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
Disconnected or damaged harness to Thermona gas valve, Faulty gas valve coil, Incorrect polarity or earthing, Faulty PCB gas valve driver
How to Fix / Troubleshooting
Safety: Gas components must only be serviced by a qualified gas engineer. Isolate gas and power before opening the boiler.
- Check supply polarity: Ensure live, neutral, and earth are correctly connected at the boiler terminal block. Incorrect polarity can affect gas valve operation.
- Visual inspection: Inspect the gas valve connector and wiring for damage or loose plugs.
- Engineer tests: A technician should measure coil resistance of the Thermona gas valve, check for 230 V (or specified) supply during ignition, and verify the PCB output. Replace the gas valve or PCB as required.
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Repair Difficulty
Professional Required
5/5
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