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 Code System Behaviour
10 Outside sensor error
20 Flow sensor error
40 Return sensor error
61 Bus communication error
78 Water pressure out of range
105 Venting program active when power turn on/ interrupted (runs for 7 mins)
110 Exceeded safety temperature
111 Exceeded maximum pressure
119 X2 link positions 4 and 5 are missing
129 Fan doesn’t start
133 No flame after 5 ignition attempts
151 Fan error or control unit defective (speed control is not achieved)
154 Return greater than flow – flow temperature increases too fast
101 Overheat error
102 Pressure sensor fault
104 Flow check failed
108 Pressure needs filling
1P4 Pressure needs filling to 0.5 – 0.8 bar
109 Pressure > Pmax error
110 Send probe damaged
112 Return probe error – could be damaged
114 Outdoor sensor error – could be damaged
141 Central heating flow switch is open
201 Domestic hot water (DHW) probe damaged
203 Tank probe damaged
303 Printed circuit board (PCB) error
304 Too many resets have occurred
501 No flame detected
612 Fan fault – fan isn’t starting up

iC & iS Combi Boiler Error Codes

Fault Code  System Behaviour 
50 Domestic hot water (DHW) sensor error
117 Pressure greater than 3 bar or pump pressure increase is too high
118 Pressure 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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