Atag iC & iS Fault Codes
CombiSystem Natural GasLPG 24-40 kW 2013-present
GC Numbers: 47-311-0147-311-0247-311-0341-311-1341-311-1441-311-1547-311-1547-311-1647-311-1741-311-1941-311-2041-311-21
The fault code is already on your display
Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →
Most common fault codes
117 118
Your boiler has detected that the water pressure inside the system is far too high, causing it to shut down for safety.
May be DIY safe · £100-280
Your boiler has detected that the water pressure is too low for it to operate safely, or it is struggling to move water through the system.
May be DIY safe · £0-280
All 3 fault codes
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