GREE GMV5E DC INVERTER VRF UNITS SERVICE MANUAL
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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.
3.2.1.2 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 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.
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