Boiler Fault Code PUMP PROTECTION ACTIVATED

Also written as PUMPPROTECTIONACTIVATED — same fault.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026

Fault code PUMP PROTECTION ACTIVATED appears across 1 boiler brand and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has detected that the water pump is stuck or failing to circulate water correctly and has shut itself down to prevent internal damage. (As reported on Ariston Genus 24 MFFI)