BoilerFaultCodes 72:0 Low
Boiler Fault Code 72:0
Also written as 720 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 72:0 appears across 1 boiler brand and 5 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is notifying you that the hot water circulation pump is currently active based on its set schedule, though it may indicate a minor communication lag with the sensor. (As reported on Viessmann Vitodens 200)
Pick your boiler brand for the 72:0 fix
Source
Information for the 72:0 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