When there is something wrong with the air heater, the indicative light will show where the problem is so as to help repair the air heater.
During the fault state, the light pipe will shine at different frequencies. The times of the shining will imply different fault codes. Details are seen as follows:
| Fault Code(ER) | Implication | Solution |
| 01 | Power Failure | Check the power connection |
| 02 | Motor Failure | Check the motor connection and control panel |
| 03 | Fuel Pump Failure | Check the plug-in unit connection and control panel |
| 05 | Flame Extinguishing | Check the fuel circuit |
| 07 | Ingitor Failure | Check the plug and control panel |
| 08 | Failure of second start | Check the flame state in combustion chamber,fuel circuit and voltage |
| 09 | Failure of intake air sensor | Check the motor connection and control panel |
| 11 | Failure of cover sensor | Check the plug and control panel |
| 12 | Failure of communication(Connection broken between controller and main control panel) | Check if any looseness,open circuit or misconnection on the data lines and plug-in componets |
Advise：After the air heater fixed,please use the tape to seal the gap!