How much does it cost to fix Ferroli error code F31?

Typical repair cost for the Ferroli F31 fault is £120-220 including labour.

F31 High

Ferroli F31 Fault Code

Q: What does the Ferroli F31 fault code mean?

Your boiler is struggling to read its own temperature because a connection or a heat-sensing probe has developed a fault, causing it to shut down to prevent potential damage.

The Ferroli F31 fault code means: your boiler is struggling to read its own temperature because a connection or a heat-sensing probe has developed a fault, causing it to shut down to prevent potential damage.. It appears on 6 Ferroli models in our database.

Technical description: Heating return sensor (NTC sensor on return shorted or open)

Typical repair cost £120-220 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Ferroli models that show the F31 fault code

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

Source

Ferroli F31 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