What to do if the Mijia Air Conditioner displays error code E4?

The display of E4 on the Mijia Air Conditioner represents a fan motor fault in the fresh air system. This code indicates that the system is unable to operate normally, resulting in reduced air circulation and ventilation effectiveness.
To resolve this issue, please refer to the following steps:
1. Turn off the air conditioner and disconnect it from the power source. Wait for approximately 3 to 5 minutes before reconnecting the power. Then, turn the device back on and check if the issue is resolved;
2. If the problem is not resolved through a power restart, it is recommended to apply for after-sales service for further inspection. A professional technician can diagnose the issue and provide the necessary repairs to restore normal operation.