What happened to the E 1 when Midea's air conditioner was not cooled? Changsha air-condition maintenance

The signals 1 and E 1 indicate that the communication between the indoor unit and the outdoor unit of the air conditioner is abnormal, which may be caused by the short circuit of the connecting wire between the indoor unit and the outdoor unit. 2. The circuit wiring board in the outdoor unit or indoor unit of the air conditioner is faulty, and the wiring group of the sensor body may be broken or damaged. 3. When the compressor current is too large and the E 1 fault is caused by overheating protection, the high temperature protection will be started when the exhaust temperature of the outdoor unit is too high, so that the circuit board of the outdoor unit will be damaged, because too much dust may accumulate on the circuit board of the outdoor unit. 4. The outdoor fan is damaged. Suggested solution: 1. Check the circuit connection between indoor unit and outdoor unit. If there is an open circuit, it needs to be reconnected. 2. Check the internal circuit board of the air conditioner. The wiring of indoor unit and outdoor unit is normal. If the circuit board is damaged, it is recommended to replace it with a new one. 3. Take apart the air conditioner, and check whether there is anything dirty in it. If there is dirt, it needs to be removed. When it is found that the refrigerant is insufficient, add the refrigerant. If the compressor leaks, it needs replacement. The damaged fan needs to be replaced with a new one. 5. Excessive use of air conditioner leads to excessive dust inhalation, so that the air conditioner will be blocked, which will make the air conditioner have higher high pressure and lower low pressure, and the pressure protector will be automatically disconnected.