How much does it cost to fix Ferroli error code F 1 1?

Typical repair cost for the Ferroli F 1 1 fault is £120-200 including labour.

F 1 1 High

Ferroli F 1 1 Fault Code

Q: What does the Ferroli F 1 1 fault code mean?

Your boiler is struggling to accurately measure the temperature of the water returning to it, which causes it to stop operating correctly to protect itself.

Also written as F11 — same fault.

The Ferroli F 1 1 fault code means: your boiler is struggling to accurately measure the temperature of the water returning to it, which causes it to stop operating correctly to protect itself.. It appears on 1 Ferroli model in our database.

Technical description: Return sensor faulty

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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Ferroli models that show the F 1 1 fault code

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

Arena 30 C Repair: £120-200

Source

Ferroli F 1 1 fault code information on this page is sourced and cross-checked against the official Ferroli service / installation manuals for each affected model.

Ferroli Arena 30 C manual (PDF)

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026