Rapid temperature rise detected, boiler shuts down shortly after burner starts

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

Air lock in boiler, Closed radiator valves, Pump not running or seized, Blocked internal bypass

Safety: Turn off power and let the boiler cool before touching any components.

Check pump operation: With a call for heat, listen and feel for the pump running. If silent or excessively hot, it may be seized.
Open radiator valves: Ensure enough radiators are open to allow adequate flow.
Bleed air: Bleed the pump (if vent screw present) and radiators, starting with the highest points.
Reset: After restoring circulation, reset the boiler and monitor. If F24 recurs, stop resetting and call a technician.

Hard 4/5

Circulation Pump

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