F67
Glow-worm
PCB Flame Detection Circuit Fault
Boiler shows F67, flame detection error, may not ignite
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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
Damaged PCB, Incorrect PCB configuration, Electrical interference, Faulty ionisation electrode circuit on PCB
How to Fix / Troubleshooting
Safety: Isolate power and gas before internal work.
- Reset once: If F67 persists, PCB is likely at fault.
- Engineer tasks:
- Verify ionisation electrode and wiring are sound.
- Check earth bonding and supply quality.
- Replace and configure the main PCB as per Glow-worm instructions.
Flame detection circuitry is safety-critical; only qualified engineers should repair.
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Repair Difficulty
Professional Required
5/5
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