Boiler displays F24, rapid temperature rise detected, boiler shuts down quickly

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Pump not running or air‑locked, Blocked primary circuit, Closed valves near boiler, Incorrect pump speed setting

Safety: Turn off power and allow the boiler to cool.

Checks:

Verify system pressure is correct and bleed air from the pump and radiators.
Remove the pump vent screw (if fitted) and manually turn the pump shaft with a screwdriver to free it if seized. Replace the pump if it cannot be freed or is noisy.
Ensure all isolation valves around the boiler and pump are open.
Check for blocked strainers or filters and clean them.

After repair: Restore power, reset the boiler, and confirm that the temperature rises smoothly without triggering F24.

Medium 3/5

Circulation Pump

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