What caused the failure code er20 1 of Samsung Central Air Conditioning?

According to the information you provided, the central air conditioner indicated that E20 1 was a communication failure between the internal and external machines. I suggest you contact the property to help you check whether the power supply of the external machine is normal and whether the connecting wires of the internal and external machines are loose. If you can't check, you can also call Samsung's key customer line 400-6 10-5858 directly, and a professional engineer will help you check.

If you have any comments, suggestions and comments, please click: support.samsung.com.cn/survey.