A 1 6 High

Ferroli A 1 6 Fault Code

Also written as A16 — same fault.

The Ferroli A 1 6 fault code means: your boiler's control system has lost its internal connection to the parts responsible for lighting the flame, meaning it cannot start up to provide heat or hot water.. It appears on 1 Ferroli model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: No communication between main board and ignition devices
Typical repair cost £150-350 (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 1 6 fault code

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

Source

Ferroli A 1 6 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 7 July 2026