25 High
Your boiler is getting too hot too quickly and is shutting itself down to prevent damage.
Technical description: Boiler operates with high boiler water temperature
Typical repair cost: £150-450 (including labour)
DIY fix possible
Check that your radiator valves are fully openEnsure the central heating pump is runningCheck if the system water pressure is between 1.0 and 1.5 bar
Protect yourself from future repair bills
A boiler cover plan would cover faults like 25 — no call-out fees, no surprises.
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Parts commonly replaced
- Circulation pump
- Temperature sensors (NTC thermistors)
- Heat exchanger (descaling)
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