Gree GMV5 Series Service Manual page 187

7. As shown in the figure below, put the black test probe to pad W (RD) and the red test probe to pad NW
(make sure the moisture proof tape is removed). In normal cases, the multimeter should read 0.39± 0.3 V.
If it is ―0‖ or infinitely great, the IPM module is faulty.
1.2 Precondition: Units cannot be normally started.
Step 1:
Disconnect the power supply of the units and open the electric junction box of the compressor to see
whether wiring of the compressor is intact.
Step 2:
Measure resistance between two wiring terminals (U, V, W). The resistance value range should be
0.5~2.0 Ω.
Measure
resistance
between two
wiring terminals
using a multimeter
Measure the resistance to earth of each wiring terminal. The value should be 10 MΩ. If not, the
compressor has an internal fault.
Step 3:
Check the solenoid valves of the system, include electric expansion valves, oil return valves, and oil
balance valves. Refer to the preceding section for the test method.
Step 4:
Check the IPM module. Refer to the preceding section for the test method.
GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
Measure the
resistance to earth of
each wiring terminal
one after another
184