BoilerFaultCodesAtag E02 Fault Code
The Atag E02 fault code means: your boiler has detected an ignition failure or a flame loss, meaning it is unable to stay lit to provide heating or hot water.. It appears on 3 Atag models in our database.
Technical description: operation status boiler
DIY fix possible
Check that your gas prepayment meter has credit (if applicable)Check that other gas appliances, such as a hob, are working to confirm gas supplyPress and hold the 'Reset' button for 2 seconds to see if the boiler restarts
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Atag models that show the E02 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Atag E02 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