F.67
Vaillant
Flame Detection / PCB Fault
Boiler shows F.67, ignition/flame signal error
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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
Defective ionisation electrode, Damaged electrode cable, PCB flame detection circuit failure, Incorrect earthing
How to Fix / Troubleshooting
Safety: Isolate power and gas before accessing combustion components.
- Reset once: Try a reset. If F.67 returns, stop using the boiler.
- Check earthing: Confirm the boiler is correctly earthed at the supply.
- Engineer tasks: A technician will inspect and test the ionisation electrode and cable, and likely replace the PCB if the fault persists.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control PCB
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