BoilerFaultCodes BUS 485 High
Boiler Fault Code BUS 485
Also written as BUS485 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code BUS 485 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 boiler has lost the digital connection between its main control board and the display or smart system, meaning it cannot receive the instructions it needs to run. (As reported on Vokera Unica MAX Combi)
Pick your boiler brand for the BUS 485 fix
Source
Information for the BUS 485 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