ATAG Intermittent Ignition Control Fault

Furnace fan runs but burner does not light, no error code displayed

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

Loose ignition electrode connection, Weak spark from ignition transformer, Marginal gas pressure, Control board relay sticking

Safety first: Isolate power and gas before accessing ignition components.

Inspect and reseat the ignition electrode cable and connector.
Check the electrode for correct gap and cleanliness.
Observe through the sight glass (if fitted) whether a spark is present during start-up.
If the fan runs but there is no spark or gas valve click, the ignition transformer or control board may be failing and should be tested by a technician.

Hard 4/5

ATAG ignition transformer

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