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ATAG Fault Codes

Select a fault code to see its meaning, common causes and how to fix it.

• 105 Fault code 105 on an Atag boiler points to a problem with the condensate drainage system — typically a blocked or… Read more →
• 111 ATAG fault code 111 indicates that the boiler has detected a water temperature above its maximum permitted threshold… Read more →
• 118 Fault code 118 on an Atag boiler signals that the central heating system pressure has dropped too low — typically below… Read more →
• 119 Fault code 119 on Atag boilers indicates that the control board (PCB) cannot detect the required link — sometimes… Read more →
• 133 Fault code 133 means your Atag boiler has tried to light itself five times in a row and failed to detect a stable flame… Read more →