260 High
Your boiler has started up but cannot detect the water getting any hotter, so it has shut down to prevent overheating.
Technical description: The flow temperature sensor is not detecting a rise in temperature following a burner start
Typical repair cost: £120-£350 (including labour)
DIY fix possible
Check that your central heating valves under the boiler are fully openEnsure all your radiator valves (TRVs) are turned to a high settingCheck your system pressure is between 1 and 1.5 bar and top up if necessaryBleed your radiators to remove any trapped air pockets
Protect yourself from future repair bills
A boiler cover plan would cover faults like 260 — no call-out fees, no surprises.
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Parts commonly replaced
- Flow temperature sensor
- Circulation pump
- Main heat exchanger (flushing)
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