How much does it cost to fix Ferroli error code F44?

Typical repair cost for the Ferroli F44 fault is £100-180 including labour.

F44 High

Ferroli F44 Fault Code

Q: What does the Ferroli F44 fault code mean?

Your boiler's internal thermometer that monitors the water returning from your radiators has developed a fault, preventing the system from heating up correctly.

The Ferroli F44 fault code means: your boiler's internal thermometer that monitors the water returning from your radiators has developed a fault, preventing the system from heating up correctly.. It appears on 4 Ferroli models in our database.

Technical description: Return sensor fault

Typical repair cost £100-180 (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 F44 fault code

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

Arean Repair: £120-220
Maxima 35 S Repair: £120-200
Optima 201 Repair: £120-220
Optimax Repair: £100-180

Source

Ferroli F44 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