F28 High
Your boiler has detected that its temperature sensors are giving conflicting readings, which has caused it to stop working for safety.
Technical description: Permanent drift between flow sensor and return sensor
Typical repair cost: £120-250 (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 F28 — no call-out fees, no surprises.
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Parts commonly replaced
- Flow NTC sensor
- Return NTC sensor
- Main PCB
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