2024 ATAG Boiler Error & Fault Codes
Boiler fault codes are sequenced codes that may appear on the display screen of your boiler. The code that appears will depend on the manufacturer, but each code will have various meanings. If you know what these codes mean, then you can quickly identify and address the problem, regardless of whether you're an engineer or not.
To begin, it is important to understand the role that error codes play in maintaining proper operation. Knowing how different issues correspond to specific code numbers can help you address a problem much faster once it has developed.
Your ATAG boiler can communicate a range of fault codes to your control panel, telling you when a fault has occurred and at times suggesting potential remedies to the problem. It is important that these faults are resolved as soon as possible, as some can lead to further damage should they remain unchecked.
Regular Boiler Error Codes
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.
| Fault Code | Possible Cause |
|---|---|
| 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 turned on / interrupted (runs for 7 mins) |
| 110 | Exceeded safety temperature |
| 111 | Exceeded maximum pressure |
| 119 | X2 link position 4 and 5 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 to < 0.5 bar |
| 1P4 | Pressure needs filling to 0.5 – 0.8 bar |
| 109 | Pressure > Pmax error |
| 110 | Send probe damaged |
| 112 | Return probe error – could be damanged |
| 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 occured |
| 501 | No flame detected |
| 612 | Fan fault – fan isn’t starting up |
IC / IS Combi Boiler Error Codes
Each boiler has a number of sensors and control units - if one of these develops a fault, the boiler will display an error code on the LED screen. This is what each code means:
| Fault Code | Possible Cause |
|---|---|
| 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). |
UK