F1 High
Your boiler has detected that the water pressure in the system is too low, causing it to stop running for safety.
Technical description: Low water pressure
Typical repair cost: £0-120 (including labour)
DIY fix possible
Locate the filling loop, which is usually a flexible silver hose under the boiler.Slowly open the small tap (or taps) on the filling loop until you hear water moving.Watch the pressure gauge and close the taps exactly when the needle reaches 1.5 bar.
Protect yourself from future repair bills
A boiler cover plan would cover faults like F1 — no call-out fees, no surprises.
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Parts commonly replaced
- Filling loop
- Expansion vessel
- Pressure sensor
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