How much does it cost to fix Atag error code A9?

Typical repair cost for the Atag A9 fault is £180-350 including labour.

A9 High

Atag A9 Fault Code

Q: What does the Atag A9 fault code mean?

Your boiler is struggling to spin the internal fan that clears out exhaust gases, so it has safely shut down to prevent unsafe operation.

The Atag A9 fault code means: your boiler is struggling to spin the internal fan that clears out exhaust gases, so it has safely shut down to prevent unsafe operation.. It appears on 2 Atag models in our database.

Technical description: Rpms of fan

Typical repair cost £180-350 (including labour)

Engineer required

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

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Atag models that show the A9 fault code

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

A200 Repair: £180-350
Q 25CR Repair: £180-350

Source

Atag A9 fault code information on this page is sourced and cross-checked against the official Atag service / installation manuals for each affected model.

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