BoilerFaultCodesAtag 181 Fault Code
The Atag 181 fault code means: this is a normal operational message and not an actual fault; it simply appears for a moment when the boiler finishes its initial setup or test sequence.. It appears on 3 Atag models in our database.
Technical description: No error — briefly visible when leaving commissioning mode
DIY fix possible
No action is required as the code will disappear on its own.Wait for the boiler to return to its normal display screen.Resume normal use of your heating and hot water.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Avoid the next call-out bill
A cover plan would handle faults like 181: no call-out fees, no surprise bills.
Affiliate links. We may earn a commission at no extra cost to you.
Atag models that show the 181 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Atag 181 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