Furnace displays EC and stops, often during operation rather than at start-up

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

Weak flame signal due to dirty burner, Poor earth/ground connection, Faulty ionisation electrode, Electrical interference on ionisation circuit

Safety first: Turn off power and gas before opening the combustion chamber.

Clean the burner thoroughly to ensure a stable, even flame pattern.
Clean the ionisation electrode and check its position in the flame.
Verify that the appliance is properly earthed; tighten earth connections on the PCB and chassis.
Route ionisation and ignition cables away from high-voltage or mains cables to reduce interference.
If the EC error continues, the control board's flame detection circuit may be faulty and require replacement.

Hard 4/5

ATAG ionisation electrode

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