One is to display the fault code, and the other is to display the board fault.

Check whether the indicator light of the leakage protection line is on and whether there is voltage output. Check whether the connector between the power cord and the controller is in poor contact. If it is in poor contact, replace the controller.

There is no low voltage, so it is recommended to change the transformer. Replace the operation panel when the voltage is normal, and replace the controller when it is abnormal.