E20
ACV
Flame Detection Circuit Fault
Boiler shows E20, no ignition, may be associated with ionization current issues
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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
Damaged ionization electrode, Poor earth connection, Faulty ionization cable, Faulty control board flame circuit
How to Fix / Troubleshooting
Safety first: Isolate power and gas. Do not operate the boiler with unreliable flame detection.
- Check earthing: Ensure the boiler's earth connection is secure at the supply and on the chassis.
- Visual inspection: A competent person can inspect the ionization electrode on the ACV burner for cracks, soot buildup, or misalignment.
- Reset once: Reset the boiler and observe if it lights and stays lit. If E20 returns, stop using the boiler.
- Professional repair: A technician should measure ionization current, clean or replace the electrode, and test the PCB.
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Repair Difficulty
Hard
4/5
Required Part
Ionization Electrode
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