F.24 High
Your boiler is struggling to move water around the system, often because the water level is too low or something is blocking the flow.
Technical description: Low water / Pump Failure / Blockage
Typical repair cost: £120-350 (including labour)
DIY fix possible
Check the pressure gauge on the front of the boiler; it should be between 1.0 and 1.5 bar.If the pressure is low, use the filling loop valves underneath the boiler to top it up.Ensure all radiator valves are fully open to allow water to flow freely.
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
- Pressure sensor
- Heat exchanger
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