F65
FAULT CODE
Glow-worm
Electronics Temperature Too High
High Severity
Engineer Required
The temperature of the PCB electronics itself has exceeded safe operating limits. May indicate an external heat source or an internal electrical fault.
Step-by-Step Fix Guide
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Step 1
Check there are no external heat sources near the boiler
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Step 2
Turn off the boiler and allow to cool
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Step 3 Engineer only
Call a Gas Safe engineer if fault persists after cooling
Gas Safe Reminder
Work on gas appliances must be carried out by a Gas Safe registered engineer. The steps above cover safe checks a homeowner can perform - any internal component replacement requires a qualified professional. If in doubt, always call an engineer.