| Atag Boilers Fault Code | Possible Cause |
|---|---|
| 10 | Outside sensor error |
| 20 | Flow sensor error |
| 40 | Return sensor error |
| 50 | DHW sensor error (iC-Range only) |
| 61 | Bus communication error |
| 78 | Water pressure out of range |
| 105 | Venting program active when power turned on or interrupted (runs approx. 7 mins) |
| 110 | Safety temperature exceeded |
| 111 | Maximun pressure exceeded |
| 117 | Pressure too high (> 3 bar) or pump pressure increase too high (iC & iS Range only) |
| 118 | Pressure too low (< 1 bar) or pump pressure increase too low) no pump detection) (iC & iS Range only) |
| 119 | Link on X2 position 4 and 5 missing |
| 129 | Fan error (fan does not start up) |
| 133 | No flame after 5 ignition attempts |
| 151 | Fan error (speed control is not achieved or is out of range) or control unit defective |
| 154 | Flow temperature increases to fast, return > flow |
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