F14
Glow-worm
PCB Internal Fault / Configuration Error
Boiler shows F14, no heating or hot water, may occur after power surge
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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 main PCB, Corrupted firmware, Incorrect PCB configuration for boiler model, Overvoltage or surge damage
How to Fix / Troubleshooting
Safety: Isolate power before accessing electronics.
- Power reset: Turn off the boiler at the fused spur for several minutes, then restore power. If F14 reappears immediately, the PCB is likely faulty.
- Check supply quality: Ensure the boiler is connected to a stable 230V supply via a fused spur, not an extension lead. Consider surge protection if power quality is poor.
- Engineer tasks:
- Verify correct PCB part number for the specific Glow-worm model.
- Check for visible damage on the PCB (burn marks, swollen components).
- Replace and correctly configure the main PCB using manufacturer procedures.
PCB replacement and configuration must be done by a qualified engineer with access to Glow-worm technical data.
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Repair Difficulty
Professional Required
5/5
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