Maybe contacts of contactor was welded, which lead the heater run continuously, therefor the temperature exceeds the setting value of EGO and the alarm happens.

E-09为转轮故障警报，出现此故障表示转轮传动部分或是检测部分出现异常。可以按以下方法逐步排除。
1.确认参数F-19,出厂设定为600s，如果此值过小，会导致E-09警报。
2.打开机器左侧板，拔动转轮旁边的微动开关，机器会自动复位，此时确认转轮是否正常运行，如果运行，说明检测回路损坏，如果没有转动，则是传动机构损坏。
3.在转轮转过一圈的过程中，确认微动开关是否可以被转轮上面的凸点正常的关断，如果没有关断，则调整微动开关的位置，使其可被关断即可。

Please pay attention to confirm whether the surrounding air enter into the system. You can observe the change of dewpoint when the inlet of dehumidifier connects directly to outlet of itself.
Check the return air temp, usually it is lower than 35℃.
Check the pipeline whether there is gas leakage.
Check the dew point sensor and monitor if they are broken.