Judgement By Flashing Led Of Outdoor - Gree GVH48AH-M3DNA5A Service Manual

1. E1: High pressure protection
Malfunction description: The pressure of ODU high pressure side is too high.
Main check points:
a. Is the system pressure is normal;
b. Is the pressure switch is normal;
c. If above two issues are normal, the mainboard circuit is with malfunction, please replace mainboard.
2. E2: Freeze protection
Malfunction description: Too low tube temperature of IDU under cooling mode.
Main check point:
a. Check if the IDU fan speed is normal, if the air inlet/outlet is smooth;
b. Check if the IDU, ODU heat exchanger is too dirty that affect the heat exchanging effect.
Pressure switch terminal of high Pressure