E1 protection: High voltage protection for the system. When high voltage protection is detected for 3 seconds in a row, the load except the light box is turned off, all keys and remote control signals are shielded, and the indicator flashes and the fault code E1 is displayed. E2 protection: for indoor anti-freezing protection. In the mode of refrigeration and dehumidification, when the compressor starts for 6 minutes and detects T steaming <-5 degrees C for 3 minutes, the indicator flashes and displays the fault code E2, stops the compressor and the external fan; when T steaming > 6 degrees C and the compressor has stopped for 3 minutes, the indicator lights go out and the liquid crystal resumes to show the original state of operation. No shielding buttons.
E3 protection: low voltage protection for the system. The low-voltage switch signal is detected after the compressor starts for 3 minutes. If the low-voltage switch is disconnected for 3 minutes, the whole machine will stop. The indicator flashes and the fault code E3 is displayed to indicate the leakage of fluorine. E4 protection: high temperature protection for exhaust pipe. After starting the compressor, the indicator flashes and the fault code E4 is displayed when the exhaust temperature is higher than 120 C or the short circuit (or open circuit) of the exhaust temperature sensor is detected for 30 seconds.
E5 Protection: Low Voltage Protection. After the compressor is running, if the current exceeds 25A for 3 seconds, the indicator flashes and the fault code E5 is displayed. EH protection: electrical heating failure. Send out the "BB" alarm sound and the red light flashes. When the annular temperature is higher than 35 C, it is forced to enter the refrigeration. The reasons for the failure are as follows: AC contactor internal adhesion, AC contactor must be replaced. If the fuse is not working properly, the fuse must be replaced.