Boiler Fault Code Pump over run thermostat 87˚C

Also written as PUMPOVERRUNTHERMOSTAT87C — same fault.

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

Fault code Pump over run thermostat 87˚C appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has reached a high temperature because the pump stopped spinning prematurely, preventing the system from cooling down properly. (As reported on Firebird Envirogreen)