F76
FAULT CODE
Heatline
Thermal Fuse Fault
High Severity
Engineer Required
The thermal fuse on the heat exchanger has blown due to extreme overheating. The heat exchanger will need replacing.
Step-by-Step Fix Guide
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Step 1
Call a Gas Safe engineer — the heat exchanger must be replaced
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Step 2 Engineer only
Do not attempt to bypass the thermal fuse
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.