F41 High
Your boiler has sensed that the temperature is rising too quickly inside the unit, often caused by water not flowing through the pipes fast enough.
Technical description: Activation of maximum ELTA T protection
Typical repair cost: £100-£350 (including labour)
DIY fix possible
Check that your boiler pressure is between 1.0 and 1.5 barEnsure all radiator valves and isolation valves are fully openCheck for any air trapped in the system and bleed your radiators
Protect yourself from future repair bills
A boiler cover plan would cover faults like F41 — no call-out fees, no surprises.
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Parts commonly replaced
- Circulation Pump
- Temperature Sensors (NTC)
- Main Heat Exchanger (if blocked)
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