How much does it cost to fix Ferroli error code E31?

Typical repair cost for the Ferroli E31 fault is £150-250 including labour.

E31 High

Ferroli E31 Fault Code

Q: What does the Ferroli E31 fault code mean?

Your boiler is struggling to detect the flow of water inside the system because the sensor responsible for monitoring it is sending an invalid signal.

The Ferroli E31 fault code means: your boiler is struggling to detect the flow of water inside the system because the sensor responsible for monitoring it is sending an invalid signal.. It appears on 3 Ferroli models in our database.

Technical description: Flow sensor fault (short/open circuit)

Typical repair cost £150-250 (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 E31 fault code

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

Maxima 35 S Repair: £150-250
Modena F Repair: £0-120
Modena HE Repair: £80-120

Source

Ferroli E31 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