Gree GMV-VQ680WM/C-X Service Manual page 316

Gree
4.3.1.1 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 and expansion board are damaged.
（5） Check whether the varistors on the main board and expansion board are damaged.
4.3.1.2 Electrical Inspection
Check the power cable from the main switch board to the hydro box:
（1） 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:
Voltage between L and N: 220-240 VAC.
（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
314