How much does it cost to fix Viessmann error code bc?

Typical repair cost for the Viessmann bc fault is £90-280 including labour.

bc Medium

Viessmann bc Fault Code

Q: What does the Viessmann bc fault code mean?

Your boiler has lost its connection with the remote control unit used to manage your primary heating circuit.

Also written as BC — same fault.

The Viessmann bc fault code means: your boiler has lost its connection with the remote control unit used to manage your primary heating circuit.. It appears on 7 Viessmann models in our database.

Technical description: Control mode without remote control: Communication fault - Vitotrol remote control heating circuit A1

What causes the Viessmann bc fault?

This fault occurs when the boiler's main internal computer loses its digital link with the Vitotrol thermostat or remote control unit. The most common reason is a break in the physical wiring between the two devices or a temporary electronic glitch in the communication module. In some cases, it can be caused by the remote control unit itself failing due to age or internal component wear.

Typical repair cost £90-280 (including labour)

DIY fix possible

Check if the batteries in your Vitotrol unit need replacingEnsure the remote control is correctly docked in its wall bracketTurn the boiler power off and back on at the fused spur to reset the connection

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Viessmann models that show the bc fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Viessmann bc 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