BoilerFaultCodes 71:2 Medium
Boiler Fault Code 71:2
Also written as 712 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 71:2 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 is having trouble heating your hot water cylinder because a sensor has detected an unusually high temperature or a fault during the heating process. (As reported on Viessmann Vitodens 200)
Pick your boiler brand for the 71:2 fix
Source
Information for the 71:2 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