MXZ-5C42NA3 Service Manual

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12-5. TROUBLESHOOTING CRITERION OF MAIN PARTS
MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA MXZ-5C42NA
MXZ-2C20NA2 MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2 MXZ-5C42NA2
MXZ-2C20NA3 MXZ-3C24NA3 MXZ-3C30NA3 MXZ-4C36NA3 MXZ-5C42NA3
MXZ-2C20NA4 MXZ-3C24NA4 MXZ-3C30NA4 MXZ-4C36NA4 MXZ-5C42NA4
MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ
MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2
MXZ-2C20NAHZ3 MXZ-3C24NAHZ3 MXZ-3C30NAHZ3
MXZ-2C20NAHZ4 MXZ-3C24NAHZ4 MXZ-3C30NAHZ4
Part name Check method and criterion
Defrost thermistor (RT61)
Fin temperature thermistor (RT64)
Ambient temperature thermistor
(RT65)
Outdoor heat exchanger tempera-
ture thermistor (RT68)
Measure the resistance with a multimeter.
Refer to 12-7. “TEST POINT DIAGRAM AND VOLTAGE”, 1. “Outdoor control P.C.board”,
2. “Outdoor power P.C. board”, for the chart of thermistor.
Discharge temperature thermistor
(RT62)
Measure the resistance with a multimeter.
Before measurement, hold the thermistor with your hands to warm it up.
Refer to 12-7. “TEST POINT DIAGRAM AND VOLTAGE”, 1. “Outdoor control P.C. board” for the chart of
thermistor.
Compressor
W
U
V
WHT
RED
BLK
Measure the resistance between terminals using a multimeter. (Winding temperature: 14°F - 104°F)
Normal (Each phase)
MXZ-2C20NA2
MXZ-2C20NA3
MXZ-2C20NA4
MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA
MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2
MXZ-3C24NA3 MXZ-3C30NA3 MXZ-4C36NA3
MXZ-3C24NA4 MXZ-3C30NA4 MXZ-4C36NA4
0.63 kΩ - 0.78 kΩ 0.83 Ω - 1.03 Ω
Measure the resistance between terminals using a multimeter. (Winding temperature: 14°F - 104°F)
Normal (Each phase)
MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ
MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2
MXZ-5C42NA3 MXZ-2C20NAHZ3 MXZ-3C24NAHZ3 MXZ-3C30NAHZ3
MXZ-5C42NA4 MXZ-2C20NAHZ4 MXZ-3C24NAHZ4 MXZ-3C30NAHZ4
0.77 Ω - 0.95 Ω
Outdoor fan motor
• Refer to 12-6.
R.V. coil Measure the resistance using a multimeter. (Part temperature: 14°F - 104°F)
Normal (Each phase)
MXZ-2C20NA2
MXZ-2C20NA3
MXZ-2C20NA4
MXZ-3C24NA MXZ-3C30NA MXZ-4C36NA
MXZ-3C24NA2 MXZ-3C30NA2 MXZ-4C36NA2
MXZ-3C24NA3 MXZ-3C30NA3 MXZ-4C36NA3
MXZ-3C24NA4 MXZ-3C30NA4 MXZ-4C36NA4
1.26 kΩ - 1.62 kΩ 1.20 kΩ - 1.77 kΩ
Measure the resistance using a multimeter. (Part temperature: 14°F - 104°F)
Normal (Each phase)
MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ
MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2
MXZ-5C42NA3 MXZ-2C20NAHZ3 MXZ-3C24NAHZ3 MXZ-3C30NAHZ3
MXZ-5C42NA4 MXZ-2C20NAHZ4 MXZ-3C24NAHZ4 MXZ-3C30NAHZ4
1.24 kΩ - 1.86 kΩ
2-way valve solenoid coil Measure the resistance using a multimeter. (Part temperature: 14°F - 104°F)
Normal
MXZ-5C42NA MXZ-2C20NAHZ MXZ-3C24NAHZ MXZ-3C30NAHZ
MXZ-5C42NA2 MXZ-2C20NAHZ2 MXZ-3C24NAHZ2 MXZ-3C30NAHZ2
MXZ-5C42NA3 MXZ-2C20NAHZ3 MXZ-3C24NAHZ3 MXZ-3C30NAHZ3
MXZ-5C42NA4 MXZ-2C20NAHZ4 MXZ-3C24NAHZ4 MXZ-3C30NAHZ4
0.97 kΩ - 1.37 kΩ
Linear expansion valve
LEV
WHT
RED
YLW
ORN
BLU
Measure the resistance using a multimeter. (Part temperature: 14°F - 104°F)
Color of lead wire Normal
WHT - RED
37.4 Ω - 53.9 Ω
RED - ORN
YLW - RED
RED - BLU
OBH702M