108 High
Your boiler has stopped working because the water pressure is too low and needs to be topped up.
Technical description: Pressure needs filling to < 0.5 bar
Typical repair cost: £0-120 (including labour)
DIY fix possible
Locate the filling loop (usually a silver flexible hose) underneath your boiler.Open the valves slowly until you hear water entering the system.Watch the pressure gauge and close the valves once it reaches between 1.2 and 1.5 bar.
Protect yourself from future repair bills
A boiler cover plan would cover faults like 108 — no call-out fees, no surprises.
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Parts commonly replaced
- Filling loop
- Expansion vessel
- Pressure sensor
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