Chaffoteaux Ignition Sequence Interruption

Water heater fan runs but burner does not ignite, and no error code is shown.

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 spark from ignition electrode, Incorrect electrode gap, Gas valve not opening, Faulty ignition transformer on PCB

Safety: Isolate gas and power before working on ignition components.

Check spark: With a qualified person and cover removed, observe if a strong spark is present at the electrode during start-up.
Clean and adjust electrode: Remove carbon deposits and set the gap according to the service manual.
Verify gas supply: Ensure gas isolation valve is open and other gas appliances work.
Professional diagnosis: If spark is present but no ignition, a technician should test gas valve operation and PCB ignition output.

Hard 4/5

Ignition Electrode

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