A16 High

Ferroli A16 Fault Code

The Ferroli A16 fault code means: your boiler has detected a communication problem with the gas flow control, meaning it cannot safely ignite to provide heating or hot water.. It appears on 3 Ferroli models 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: Gas valve error – wiring disconnected or faulty gas valve
Typical repair cost £160-£320 (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 A16 fault code

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

Source

Ferroli A16 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