ATAG Combi Boiler Error Codes
ATAG Combi Boiler Error Codes

ATAG Combi Boiler Error Codes

ATAG Combi Boiler Error Codes When your ATAG boiler has an error, you will see an error symbol like the one above. This symbol is normally accompanied by one of the codes in the tables below. The ATAG Regular Boiler Error Codes are a series of numerical codes that are displayed by your boiler if you find fault with one of its components. You can use this list to identify the component causing the problem.

ATAG Boiler Error Code Solutions

Fault CodeSystem Behaviour
10Outside sensor error
20Flow sensor error
40Return sensor error
61Bus communication error
78Water pressure out of range
105Venting program active when power turn on/ interrupted (runs for 7 mins)
110Exceeded safety temperature
111Exceeded maximum pressure
119X2 link positions 4 and 5 are missing
129Fan doesn’t start
133No flame after 5 ignition attempts
151Fan error or control unit defective (speed control is not achieved)
154Return greater than flow – flow temperature increases too fast
101Overheat error
102Pressure sensor fault
104Flow check failed
108Pressure needs filling
1P4Pressure needs filling to 0.5 – 0.8 bar
109Pressure > Pmax error
110Send probe damaged
112Return probe error – could be damaged
114Outdoor sensor error – could be damaged
141Central heating flow switch is open
201Domestic hot water (DHW) probe damaged
203Tank probe damaged
303Printed circuit board (PCB) error
304Too many resets have occurred
501No flame detected
612Fan fault – fan isn’t starting up

iC & iS Combi Boiler Error Codes

Fault Code System Behaviour 
50Domestic hot water (DHW) sensor error
117Pressure greater than 3 bar or pump pressure increase is too high
118Pressure less than 1 bar or pump pressure increase too low (no pump detection)

ATAG Error code 133

If you are seeing the error code 133, your boiler’s flame is failing after 5 ignition attempts. This could be down to your condensate pipe freezing.

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