F.585 Low

Viessmann F.585 Fault Code

Also written as F585 — same fault.

The Viessmann F.585 fault code means: your boiler has identified a minor fault with an external room temperature sensor for one of your heating zones, so it is simply ignoring that sensor and running based on its own internal temperature settings instead.. It appears on 1 Viessmann model 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: Normal operation without room influence. Short circuit, room temperature sensor, heating circuit 4.
Typical repair cost £120-200 (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.585 fault code

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

Source

Viessmann F.585 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