How much does it cost to fix Viessmann error code Vitocrossal 300?

Typical repair cost for the Viessmann Vitocrossal 300 fault is £90-180 including labour.

Vitocrossal 300 Low

Viessmann Vitocrossal 300 Fault Code

Q: What does the Viessmann Vitocrossal 300 fault code mean?

Your boiler is continuing to work but cannot accurately measure the water temperature in a specific part of your system, usually because a sensor is missing or disconnected.

Also written as VITOCROSSAL300 — same fault.

The Viessmann Vitocrossal 300 fault code means: your boiler is continuing to work but cannot accurately measure the water temperature in a specific part of your system, usually because a sensor is missing or disconnected.. It appears on 5 Viessmann models in our database.

Technical description: Regulates without supply temperature sensor (low-loss header)

Typical repair cost £90-180 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Viessmann models that show the Vitocrossal 300 fault code

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

Source

Viessmann Vitocrossal 300 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