How much does it cost to fix Ferroli error code A23?

Typical repair cost for the Ferroli A23 fault is £90-180 including labour.

A23 High

Ferroli A23 Fault Code

Q: What does the Ferroli A23 fault code mean?

Your boiler's internal computer has become confused or has been programmed with the wrong settings, preventing it from operating correctly.

The Ferroli A23 fault code means: your boiler's internal computer has become confused or has been programmed with the wrong settings, preventing it from operating correctly.. It appears on 4 Ferroli models in our database.

Technical description: Card parameter error – possibly wrong card parameter setting

Typical repair cost £90-180 (including labour)

Engineer required

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

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Ferroli models that show the A23 fault code

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

Arena 30A Repair: £150-350
Domiproject Repair: £90-280
iBoiler 24 Repair: £120-350
iBoiler 28 Repair: £90-180

Source

Ferroli A23 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