Gree GMV-VQ680WM/C-X Service Manual page 295

Gree
4.2.1.1 Mechanical Inspection
（1） Confirm that the unit power is disconnected.
（2） Remove the electrical appliance cover.
（3） Check whether the power cable is fixed on the wiring board.
（4） Check whether the fuses on the main board are damaged.
（5） Check whether the varistors on the main board board are damaged.
4.2.1.2 Electrical Inspection
（1） Check the power cord from the power source to mode exchange box: Use an
ohmmeter of at least 500V DC to check whether the insulation resistance between
each phase and the ground reaches at least 1 megohm. Small insulation resistance
indicates a potential electric leakage.
Warning: Electric shock
（2） After the checking, connect the power and verify that the voltage of the power terminals
is correct:
The power voltage is between 220~240VAC±10%.
（3） Check the power on the main control board:
Confirm that the X1 and X2 on the main control board are active.
GMV6 HR DC Inverter VRF Units Service Manual
293