F.74 High
Your boiler's internal sensor that monitors water pressure has experienced an electrical failure and can no longer tell if there is enough surface water for the system to run safely.
Technical description: Electrical problem in the water pressure sensor
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
- Main PCB
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