E12
Crown
Gas Valve Control / Modulation Error
Boiler locks out with E12; may indicate gas valve or modulation fault
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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
Faulty gas valve coil, Loose gas valve wiring, Incorrect gas valve adjustment, Control board output failure
How to Fix / Troubleshooting
Critical safety: Gas valve issues can cause fire or explosion. Homeowners should limit work to visual inspection. Do not attempt to adjust or replace the gas valve unless you are a licensed gas technician.
- Check wiring: With power off, inspect the gas valve connector on the Crown boiler. Ensure it is fully seated and wires are not frayed or heat-damaged.
- Verify gas shutoff: Confirm the manual gas shutoff valve is open and that there are no external gas leaks (use a gas leak detector or soapy water on joints; never use a flame).
- Reset once: Restore power and reset the boiler one time. If E12 returns, shut the boiler down and contact a qualified technician to test the gas valve and control board.
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Repair Difficulty
Professional Required
5/5
Required Part
Gas Valve Assembly
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