Aquacomfort
Silent Ignition Failure
Heater fan runs, but burners do not light; no error code is shown.
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Safety Warning
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.
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Possible Causes
Weak igniter, Dirty flame sensor, Gas valve not opening, Air in gas line after service
How to Fix / Troubleshooting
Safety first: Turn off gas and power before removing burner or ignition components.
- Observe through sight glass: Call for heat and observe for igniter glow or spark. If no glow or spark is present, the igniter or control board may be faulty.
- Clean igniter/flame sensor: Gently clean the igniter and flame sensor surfaces with fine emery cloth, then reinstall.
- Gas supply check: Ensure the gas shutoff valve is fully open. If gas service was recently interrupted, air may be present in the line; a technician should safely purge and test it.
- Professional diagnosis: If the fan runs but there is no ignition and no error code is displayed, a technician should test the gas valve and control outputs.
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Repair Difficulty
Hard
4/5
Required Part
Igniter and Flame Sensor Assembly
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