What to do if the error code E3 is displayed on the Mijia Air Conditioner?

The E3 error code displayed on the Mijia Air Conditioner indicates a communication failure between the indoor unit's mainboard and the display panel. This issue can also be caused by problems with the mainboard, the display panel, or the connection between the two components.
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.