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refrigerant in the system firstly.
4.4.2 IPM power module (the same with rectifier)
A. Remove compressor cable, capacity cable from power module,
dial multimeter to “diode”, connect the red terminal (positive) to P of power
module, and connect the black terminal (negative) to U, V and W in turns,
check if the resistors are infinite; then connect black terminal to P, and put
red terminal on U, V and W in turns, check if there is any reading (normally
it is 386). If the above are all normal, the 3 IGBTs are good.
B. By above method please check if the three IGBT between N pole
of power module and U/V/W is normal.
C. Check if the low voltage board of power module is burnt out.
4.4.3 Compressor
A. Measure if the compressor coil resistors among 3 phases are all
0.481Ω/20 by the megohmmeter.
B. The insulation resistors to ground of 3 phases are all over 30MΩ
Part 2
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