E118 High
Your boiler has stopped working because the water pressure in the system has dropped too low and needs topping up.
Technical description: Primary system water pressure too low
Typical repair cost: £0-120 (including labour)
DIY fix possible
Locate the filling loop (usually two braided silver hoses or blue levers) underneath the boiler.Open the valves slowly until you hear water entering the system.Watch the pressure gauge and close the valves tightly once the needle reaches 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
- Expansion vessel
- Pressure relief valve
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