BoilerFaultCodes Water Circulation LOCKOUT High
Boiler Fault Code Water Circulation LOCKOUT
Also written as WATERCIRCULATIONLOCKOUT — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code Water Circulation LOCKOUT appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has switched itself off because it has detected that water is failing to move through the system correctly, causing it to overheat. (As reported on Potterton Performa SL HE 9 2)
Pick your boiler brand for the Water Circulation LOCKOUT fix
Source
Information for the Water Circulation LOCKOUT fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026