F.73 High
Your boiler has lost signal from its internal water pressure monitor, meaning it cannot confirm if there is enough water to run safely.
Technical description: Water pressure sensor not connected or has short-circuited
Typical repair cost: £120-220 (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.73 — no call-out fees, no surprises.
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Parts commonly replaced
- Water pressure sensor
- Wiring harness
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