E118 High
Your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.
Technical description: Primary system water pressure too low (< 0.5 bar).
Typical repair cost: £0-120 (including labour)
DIY fix possible
Locate the filling loop (usually a silver braided hose with two blue-handled valves) underneath the boiler.Slowly open both valves until you hear water entering the system.Watch the pressure gauge and close both valves firmly 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 E118 — no call-out fees, no surprises.
*Affiliate links — we may earn a commission at no extra cost to you. Prices shown are starting prices.
Parts commonly replaced
- Filling loop valves
- Expansion vessel
- Pressure sensor
*Affiliate links — we may earn a commission at no extra cost to you.