E12
Remeha
Gas valve control fault / modulation error
Furnace shows E12, burner stops unexpectedly during operation
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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 coil, Loose gas valve connector, Faulty main control PCB gas output, Incorrect gas type or pressure
How to Fix / Troubleshooting
Safety first: Shut off gas and power before touching the gas valve. Only gas-safe certified technicians should work on gas components.
- Visual inspection: Check the gas valve body and wiring for signs of overheating, burning, or mechanical damage.
- Check connector: Ensure the multi-pin connector on the gas valve is fully seated and free of corrosion.
- Gas supply check: Confirm that the inlet gas pressure and gas type match the furnace rating plate (technician task).
- Coil and modulation test: A technician should measure coil resistance and verify modulation voltage from the PCB during operation.
- Replace components: If the valve fails tests, replace the gas valve assembly. If the valve is good but control signals are absent or erratic, replace the main control PCB.
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Repair Difficulty
Professional Required
5/5
Required Part
Gas Valve Assembly
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