F.142 High

Viessmann F.142 Fault Code

Also written as F142 — same fault.

The Viessmann F.142 fault code means: your boiler's electronic brain is unable to talk to the fan, which means the system cannot safely vent gases, so it has shut down to protect your home.. It appears on 4 Viessmann models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Communication error, fan unit
Typical repair cost £250-450 (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 F.142 fault code

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

Source

Viessmann F.142 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 7 July 2026