Ideal No Ignition Without Fault Code

Water heater fan runs but burner does not light, no 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

Gas isolation valve closed, Air in gas line, Weak ignition spark, Flame sensor contamination

Safety: Turn off power and gas before removing covers. Do not repeatedly attempt ignition if you smell gas.

Check gas valve: Ensure the external gas isolation valve to the heater is fully open.
Purge air: After gas work or long shutdown, air may be in the line. A qualified engineer should purge and test.
Clean ignition and flame sensor: As per service instructions, gently clean electrodes with fine abrasive pad.
Monitor for codes: If the issue persists, a fault code may eventually appear, guiding further diagnosis by a technician.

Hard 4/5

Ignition Electrode Assembly

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