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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
QXFT-F310zN450
0.79±7%Ω
0
.79±7%Ω
0.79±7%Ω
Measure the ground resistance of each wiring terminal. The resistance should be above 10 megohm. If not, we can
determine 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.
