BoilerFaultCodesAtag 117 Fault Code
The Atag 117 fault code means: your boiler has stopped working because the water pressure inside the system has risen too high, likely due to a faulty filling loop or a system issue.. It appears on 4 Atag models in our database.
Technical description: Water pressure is too high (> 3.0 bar). The boiler is taken out of operation.
DIY fix possible
Locate the radiator bleed valves throughout your home.Place a cloth under a valve and use a radiator key to slowly release some water until the pressure gauge on the boiler drops to between 1.0 and 1.5 bar.Check the boiler control panel to see if the error has cleared.
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Atag models that show the 117 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Atag 117 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