Glow-worm
Ignition sequence interruption
Furnace fan runs but burner does not light, no error code 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
Faulty gas valve not opening, Ignition electrode not sparking, PCB not sending ignition signal, Loose wiring on Glow-worm ignition circuit
How to Fix / Troubleshooting
Safety: Gas and ignition components must be serviced by a Gas Safe engineer.
User steps:
- Attempt a single reset from the control panel.
- Confirm gas supply to the property is available.
Technician steps:
- Check for spark at the ignition electrode during start-up.
- Verify voltage at the gas valve coil when ignition is called.
- Inspect wiring between PCB, ignition transformer, and gas valve.
- Replace faulty ignition electrode, gas valve, or PCB as indicated by tests.
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Repair Difficulty
Professional Required
5/5
Required Part
Ignition Electrode / Gas Valve
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