BoilerFaultCodes d.72 Low
Boiler Fault Code d.72
Also written as D72 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code d.72 appears across 1 boiler brand and 14 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler's pump is running longer than it should to cool down the system after heating water, usually because a sensor has detected a temperature imbalance. (As reported on Vaillant ecoMAX)
Pick your boiler brand for the d.72 fix
Source
Information for the d.72 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