How much does it cost to fix Viessmann error code All Boilers?

Typical repair cost for the Viessmann All Boilers fault is £180-450 including labour.

All Boilers High

Viessmann All Boilers Fault Code

Q: What does the Viessmann All Boilers fault code mean?

Your boiler's main control system has lost its programmed settings or is struggling to communicate with the internal sensors, meaning it cannot decide when to turn on or off.

Also written as ALLBOILERS — same fault.

The Viessmann All Boilers fault code means: your boiler's main control system has lost its programmed settings or is struggling to communicate with the internal sensors, meaning it cannot decide when to turn on or off.. It appears on 5 Viessmann models in our database.

Technical description: Control mode issue

Typical repair cost £180-450 (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 All Boilers fault code

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

Source

Viessmann All Boilers 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