F63
Glow-worm
EEPROM / PCB Configuration Fault
Boiler shows F63, internal error, may not respond to controls
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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
Corrupted PCB memory, Incorrect PCB fitted, Power surge damage, Firmware error
How to Fix / Troubleshooting
Safety: Isolate power before accessing electronics.
- Power cycle: Turn off power for several minutes, then restore. If F63 persists, PCB replacement is likely required.
- Engineer tasks:
- Verify correct PCB part number for the boiler model.
- Attempt reconfiguration if supported by Glow-worm tools.
- Replace PCB if memory is corrupted.
PCB work should be carried out by a qualified engineer.
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Repair Difficulty
Professional Required
5/5
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