F001 High
Your boiler has switched itself off because the water inside the system has become too hot.
Technical description: Temperature too high during central heating demand
Typical repair cost: £100-£350 (including labour)
DIY fix possible
Check that at least two or three radiator valves are fully open to allow water to flow.Ensure there are no obstructions or trapped air by bleeding your radiators.Check your boiler pressure gauge and top it up to 1.5 bar if it is too low.
Protect yourself from future repair bills
A boiler cover plan would cover faults like F001 — no call-out fees, no surprises.
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Parts commonly replaced
- Circulation Pump
- Flow/Return Temperature Sensor
- Main Heat Exchanger (Flushing)
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