F.74 High
Your boiler has detected a problem with the sensor that monitors water pressure, meaning it cannot accurately tell if there is enough water in the system to run safely.
Technical description: Water pressure sensor signal outside correct range, the sensor signal is too high
Typical repair cost: £140-£220 (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.74 — no call-out fees, no surprises.
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Parts commonly replaced
- Water pressure sensor
- Wiring harness
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