F.24 High
Your boiler has shut down because it is heating up much faster than it should, which usually means the water isn't moving through the system properly.
Technical description: Safety switch off temperature is rising to fast
Typical repair cost: £150-£450 (including labour)
DIY fix possible
Check that your boiler pressure is between 1.0 and 1.5 bar on the digital displayEnsure all radiator valves are fully open to allow water to flowPress the reset button (flame symbol with a cross) to see if the fault clears
Protect yourself from future repair bills
A boiler cover plan would cover faults like F.24 — no call-out fees, no surprises.
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Parts commonly replaced
- Circulating Pump
- Temperature Sensors (NTC Thermistors)
- Main Heat Exchanger (Flushing)
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