E118 High
Your boiler has detected that there is not enough water pressure in the system to operate safely, causing it to shut down.
Technical description: Primary system water pressure too low
Typical repair cost: £0-120 (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 on the filling loop until you hear water flowing.Monitor the pressure gauge and close the taps when the needle reaches between 1 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
- Pressure sensor
- Expansion vessel
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