BoilerFaultCodes 9E Medium
Boiler Fault Code 9E
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 9E appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your solar heating system is struggling to move fluid correctly, which could be due to a blockage, air in the pipes, or a safety sensor cutting in to prevent overheating. (As reported on Viessmann Vitodens 242-F FB2B)
Pick your boiler brand for the 9E fix
Source
Information for the 9E 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