How much does it cost to fix Ferroli error code A-5?

Typical repair cost for the Ferroli A-5 fault is £250-400 including labour.

A-5 High

Ferroli A-5 Fault Code

Q: What does the Ferroli A-5 fault code mean?

Your boiler's electronic controller has hit an internal error and is unable to start the heating process correctly.

Also written as A5 — same fault.

The Ferroli A-5 fault code means: your boiler's electronic controller has hit an internal error and is unable to start the heating process correctly.. It appears on 2 Ferroli models in our database.

Technical description: Waiting time operating: replace P.C.B.

Typical repair cost £250-400 (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 A-5 fault code

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

Arean Repair: £250-400
Optima 201 Repair: £250-400

Source

Ferroli A-5 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