F.76 High
Your boiler has shut down because a safety sensor has detected that the main heat exchanger is getting too hot.
Technical description: Overheating protection on – primary heat exchanger has responded
Typical repair cost: £180-600 (including labour)
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Protect yourself from future repair bills
A boiler cover plan would cover faults like F.76 — no call-out fees, no surprises.
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Parts commonly replaced
- Overheat Safety Thermal Fuse
- Primary Heat Exchanger
- Main PCB
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