F14 High
Your boiler has shut down because the water inside the central heating system has reached an unsafely high temperature.
Technical description: Central heating flow T° > 95°C
Typical repair cost: £120-350 (including labour)
DIY fix possible
Check that all radiator valves are fully openEnsure the boiler pressure gauge is between 1.0 and 1.5 barSwitch the boiler off and back on again to reset the system after it has cooled down
Protect yourself from future repair bills
A boiler cover plan would cover faults like F14 — no call-out fees, no surprises.
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Parts commonly replaced
- Circulating pump
- Flow temperature sensor (NTC)
- Main heat exchanger (flushing/cleaning)
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