BoilerFaultCodesYour boiler has stopped working because the water pressure in the central heating system has dropped too low.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Insufficient system pressure
What causes this fault?
This fault occurs when the water level inside your central heating system drops below the minimum level required for the boiler to operate safely. The most common reasons for this are a small leak somewhere in your radiator pipework or the air being released from the system through a valve.
This fault is frequently seen in autumn or winter when the heating is turned on for the first time after being dormant for several months.
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.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →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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Could it be time for a new boiler?
If repair costs are adding up, a new energy-efficient boiler could be the smarter long-term choice.
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