F29 High
Your boiler has shut down because a safety component has detected that the internal temperature reached a level high enough to potentially damage the system.
Technical description: Thermal fuse
Typical repair cost: £180-350 (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 F29 — no call-out fees, no surprises.
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Parts commonly replaced
- Main Heat Exchanger
- Thermal Fuse
- Wiring Harness
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