180 Low

Atag 180 Fault Code

The Atag 180 fault code means: this is a normal operational message indicating the boiler is finishing its internal testing mode and returning to regular operation.. It appears on 3 Atag models in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: No error — briefly visible when leaving chimney sweep function
Typical repair cost £0 (including labour)

DIY fix possible

No action is requiredWait a few seconds for the code to disappearEnsure the boiler returns to its normal temperature display

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Atag models that show the 180 fault code

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

Source

Atag 180 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