BoilerFaultCodesAtag 117 Fault Code
The Atag 117 fault code means: your boiler has detected that there is too much water pressure in the system or the pump is forcing water through too quickly.. It appears on 8 Atag models in our database.
Technical description: Pressure too high (>3 bar) or pump pressure increase too high
DIY fix possible
Check that the internal or external filling loop valves are tightly closed.Locate a radiator bleed valve and use a key to release water into a cloth until the pressure gauge returns to 1.5 bar.Restart the boiler once the pressure is back in the green zone.
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 117: 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 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 31 August 2026