BoilerFaultCodes 72:2 Low
Boiler Fault Code 72:2
Also written as 722 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 72:2 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 has detected that a hot water sensor is reporting a temperature increase when it was not expected to, likely due to a sensor being in the wrong position or failing. (As reported on Viessmann Vitodens 300-W)
Pick your boiler brand for the 72:2 fix
Source
Information for the 72:2 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