Gree GUD24W2/D-D(U) - Page 74

GREE DC INVERTER HEAT PUMP CONDENSING UNIT SERVICE MANUAL
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Step 4:
Check the drive board of compressor, i.e. the IPM module.
Please refer to the IPM checking method in the section of troubleshooting.
Check the drive board of compressor, i.e. the IPM module.
Please refer to the IPM checking method in the section of troubleshooting.
B
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On condition that the unit cannot be started up.
Step 1:
Cut off the power supply and detach the cover of the wiring box of the compressor. Check the wiring of the
compressor.
Step 2:
Check the resistance between the wiring terminals (U, V, W) of compressor.
Refer to the following table for the resistance between any two terminals:
Compressor model UV Winding resistance VW Winding resistance WU Winding resistance
QXFS-M180zX170
1.62±7%Ω
0.78±7%Ω
1.62±7%Ω
0.78±7%Ω
1.62±7%Ω
0.78±7%Ω
QXFS-B238zX070
QXFS-D280zX070 0.765±7%Ω 0.765±7%Ω 0.765±7%Ω
QXAS-F428zX450L 0.54±7%Ω 0.54±7%Ω 0.54±7%Ω
Measure the earth resistance of each wiring terminal. The resistance should be above 10 megohm. If not, we
can judge that the compressor is faulted inside.
Step 3:
On condition that the unit cannot be started up, we also need to check the solenoid valve assembly of the
system, including the electronic expansion valve. The checking method is the same as instructed above.
Step 4:
Check whether the IPM module is normal. Please refer to the IPM checking method in the section of
troubleshooting.