F76
FAULT CODE
Glow-worm
Thermal Fuse Fault (Betacom/Ultracom)
High Severity
Engineer Required
On Glow-worm Betacom and Ultracom models, F76 indicates a thermal fuse fault. The thermal fuse is a one-time safety device that cuts power on extreme overheating.
Step-by-Step Fix Guide
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Step 1
Do not attempt to replace the thermal fuse yourself
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Step 2
Turn off the boiler
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Step 3 Engineer only
Call a Gas Safe engineer — if the fuse has blown, the root cause of overheating must be identified before replacement
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.