BoilerFaultCodesViessmann be Fault Code
Also written as BE — same fault.
The Viessmann be fault code means: your boiler is having trouble communicating with the wall-mounted thermostat control because of a setup or configuration error.. It appears on 7 Viessmann models in our database.
Technical description: Control mode: Vitotrol remote control incorrectly encoded
What causes the Viessmann be fault?
This fault occurs when there is a mismatch between the boiler's settings and the physical remote control device installed on your wall. It essentially means the boiler is looking for a specific type of controller that it cannot find or recognize, often due to an incorrect configuration code being entered into the system. In some cases, a loose connection or damaged wiring between the boiler and the thermostat can also trigger this communication failure.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Viessmann models that show the be fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Viessmann be fault code information on this page is sourced and cross-checked against the official Viessmann service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026