F37 High
Your boiler has stopped working because the water pressure inside the system is too low.
Technical description: Incorrect system water pressure
Typical repair cost: £60-120 (including labour)
DIY fix possible
Locate the filling loop (usually a silver flexible hose) under or near the boiler.Slowly open the valve or valves until you hear water flowing into the system.Watch the pressure gauge and close the valves once the needle reaches 1.5 bar.
Protect yourself from future repair bills
A boiler cover plan would cover faults like F37 — no call-out fees, no surprises.
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Parts commonly replaced
- Filling loop
- Pressure sensor
- Expansion vessel
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