F.5 High
Your boiler has got too hot and has automatically shut down for safety to prevent damage.
Technical description: The system has suffered a fault due to overheating.
Typical repair cost: £120-280 (including labour)
DIY fix possible
Turn off the boiler and wait 20 minutes for it to cool down.Ensure all radiator valves and the boiler's isolation valves are fully open.Locate the reset button (often marked with a flame symbol or 'R') and press it once.
Protect yourself from future repair bills
A boiler cover plan would cover faults like F.5 — no call-out fees, no surprises.
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Parts commonly replaced
- Overheat Thermostat
- Circulation Pump
- NTC Sensor
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