How much does it cost to fix Ferroli error code 39?

Typical repair cost for the Ferroli 39 fault is £90-180 including labour.

39 Low

Ferroli 39 Fault Code

Q: What does the Ferroli 39 fault code mean?

Your boiler has paused temporarily because it detected an unusual reading, likely from the outdoor temperature sensor, and will restart itself once the reading returns to normal.

The Ferroli 39 fault code means: your boiler has paused temporarily because it detected an unusual reading, likely from the outdoor temperature sensor, and will restart itself once the reading returns to normal.. It appears on 3 Ferroli models in our database.

Technical description: Temporary shutdown fault - resets automatically as soon as the value comes back within the boiler’s normal working range

Typical repair cost £90-180 (including labour)

DIY fix possible

Check if the outdoor temperature sensor is covered in snow or ice and gently clear itWait for the boiler to automatically restart when the outside temperature stabilisesMonitor the boiler to see if the fault clears without intervention

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Ferroli models that show the 39 fault code

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

Source

Ferroli 39 fault code information on this page is sourced and cross-checked against the official Ferroli service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026