E118 High
Your boiler has stopped working because the water pressure in the central heating system has dropped too low.
Technical description: System pressure too low
Typical repair cost: £0-160 (including labour)
DIY fix possible
Locate the filling loop (the silver flexible hose usually found under the boiler).Open the small black valves slowly until you hear water flowing.Watch the pressure gauge and close the valves once it reaches between 1.0 and 1.5 bar.
Protect yourself from future repair bills
A boiler cover plan would cover faults like E118 — no call-out fees, no surprises.
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Parts commonly replaced
- Filling loop valve
- Expansion vessel
- Pressure relief valve
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