BoilerFaultCodesAtag 61 Fault Code
The Atag 61 fault code means: your boiler has lost the ability to communicate with its internal control systems or the external thermostat, meaning it cannot receive instructions to heat your home.. It appears on 7 Atag models in our database.
Technical description: Bus communication error (contact open)
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 61 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Atag 61 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