F37 High
Your boiler has detected that the water pressure in the system is too low to operate safely and has shut down to prevent damage.
Technical description: Low water pressure
Typical repair cost: £0-160 (including labour)
DIY fix possible
Locate the filling loop (usually a silver flexible hose) underneath or near the boiler.Slowly open the one or two taps/valves on the filling loop until you hear water flowing.Watch the pressure gauge and close the taps firmly when the needle reaches between 1.0 and 1.5 bar.Restart the boiler if it does not reset automatically.
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
- Expansion vessel
- Pressure sensor
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