0E37 High
Your boiler has stopped working because the water pressure in the central heating system has dropped too low.
Technical description: Insufficient system pressure
Typical repair cost: £0-120 (including labour)
DIY fix possible
Locate the external filling loop, which is usually a flexible silver hose with one or two small valves.Slowly open the valve(s) until you hear water entering the system.Watch the pressure gauge and close the valves tightly once the needle reaches between 1.0 and 1.5 bar.
Protect yourself from future repair bills
A boiler cover plan would cover faults like 0E37 — no call-out fees, no surprises.
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Parts commonly replaced
- Filling loop hose
- Expansion vessel
- Pressure relief valve
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