Error A20, unit may lock out with no obvious mechanical issue.

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.

Possible Causes

Short to earth on ionization cable, Contaminated burner causing stray currents, Faulty control board flame circuit, Incorrect grounding

Safety: Turn off gas and power before inspection.

Inspect ionization cable: Look for damaged insulation or contact with metal parts. Reroute or replace if necessary.
Clean burner: Remove and clean the burner thoroughly to remove oxidation and deposits that may cause false flame detection.
Check earth: Verify that the appliance earth connection is solid and that there are no loose earth wires.
Board test: If wiring and burner are correct, the control board’s flame detection circuit may be faulty and should be replaced by a technician.

Hard 4/5

Flame Detection Electrode

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