F.58 Low

Viessmann F.58 Fault Code

Also written as F58 — same fault.

The Viessmann F.58 fault code means: your boiler is operating in a basic mode because it has lost the signal from your room thermostat, meaning it cannot adjust its temperature based on how warm your home is.. It appears on 4 Viessmann models in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Control mode without room influence
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.58 fault code

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

Source

Viessmann F.58 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