Filling Low

Boiler Fault Code Filling

Also written as FILLING — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code Filling 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 currently in the process of being filled with water, and the control system is waiting for the pressure to reach the correct level before it can start working again. (As reported on Viessmann Vitodens 200)

Pick your boiler brand for the Filling fix

Viessmann Filling 5 models

Source

Information for the Filling 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