F.574 Medium

Viessmann F.574 Fault Code

Also written as F574 — same fault.

The Viessmann F.574 fault code means: your boiler is struggling to read the temperature correctly because a sensor that tracks the warmth in your home has signal issues.. It appears on 2 Viessmann models in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: Room temperature sensor for heating circuit 1 not available
Typical repair cost £120-250 (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.574 fault code

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

Source

Viessmann F.574 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