F0 278 High
Your boiler has stopped working because its internal computer has detected a problem with the sensors that monitor its performance.
Technical description: The sensor test has failed – cabling and plug sensors need checking
Typical repair cost: £120-280 (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 F0 278 — no call-out fees, no surprises.
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Parts commonly replaced
- Flow/Return Temperature Sensor
- Wiring Harness
- Main PCB
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