E20
Crown
Hard Lockout After Multiple Faults
Boiler displays E20; may indicate lockout due to repeated ignition failures
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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
Unresolved ignition or flame faults, Persistent gas supply issues, Control board safety lockout
How to Fix / Troubleshooting
Safety: Do not repeatedly reset a boiler that continues to fault. Identify and correct the underlying issue first.
- Review prior errors: Many Crown controls log previous error codes. Note any ignition, flame, or gas-related codes that occurred before E20.
- Address root cause: Follow the relevant steps for ignition or flame faults (clean flame sensor, check gas supply, inspect burner and venting).
- Single reset: After correcting obvious issues, perform a single reset according to the manual. If E20 or the original fault returns, shut the boiler down and call a qualified technician.
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Repair Difficulty
Hard
4/5
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