BoilerFaultCodes I.59 Low
Boiler Fault Code I.59
Also written as I59 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code I.59 appears across 1 boiler brand and 4 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has recently had its internal settings reset or restored to their factory defaults, which is usually a temporary status message rather than a breakdown. (As reported on Viessmann Vitodens 222-F B2TF)
Pick your boiler brand for the I.59 fix
Source
Information for the I.59 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 7 July 2026