28 High

Atag 28 Fault Code

The Atag 28 fault code means: your boiler has stopped working because the internal fan, which safely pushes exhaust gases out of your home, is not spinning or communicating with the main control board.. It appears on 6 Atag 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: Fan speed error (no signal from fan)
Typical repair cost £280-450 (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 28 fault code

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

Source

Atag 28 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 7 July 2026