AA 7755 Emergency

Ariston AA 7755 Fault Code

Also written as AA7755 — same fault.

The Ariston AA 7755 fault code means: your boiler has detected an issue with the system that removes waste gases, meaning it has shut down to ensure your home remains safe.. It appears on 1 Ariston model in our database.

Act immediately

Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now. This fault can be dangerous if ignored.

Technical description: Problem with the flue stat
Typical repair cost £150-300 (including labour)

Engineer required

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

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Ariston models that show the AA 7755 fault code

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

Source

Ariston AA 7755 fault code information on this page is sourced and cross-checked against the official Ariston service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026