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12-4. TROUBLESHOOTING CRITERION OF MAIN PARTS
Part name
Defrost thermistor (RT61)
Measure the resistance with a multimeter.
Refer to 12-6. "Test point diagram and voltage", 1. "Inverter P.C.
Fin temperature
board", for the chart of thermistor.
thermistor (RT64)
Ambient temperature
thermistor (RT65)
Outdoor heat exchanger
temperature thermistor
(RT68)
Measure the resistance with a multimeter. Before measurement,
hold the thermistor with your hands to warm it up.
Discharge temperature
thermistor (RT62)
Refer to 12-6. "Test point diagram and voltage", 1. "Inverter P.C.
board", for the chart of thermistor.
Measure the resistance between terminals using a multimeter.
(Temperature: -10 ~ 40°C)
Compressor
Measure the resistance between lead wires using a multimeter.
(Temperature: -10 ~ 40°C)
Outdoor fan motor
Measure the resistance using a multimeter. (Temperature: -10 ~
40°C)
R. V. coil (21S4)
Measure the resistance using a multimeter. (Temperature: -10 ~
40°C)
Expansion valve coil
(LEV)
OBH906A
Check method and criterion
MUZ-DW25VF
MUZ-DW35VF
U-V
U-W
2.27 ~ 2.80
V-W
Color of lead wire
MUZ-DW25/35VF
RED – BLK
BLK – WHT
32 ~ 43
WHT – RED
Normal (kΩ)
1.41 ~ 2.00
Normal (Ω)
Color of lead wire
RED – ORN
RED – WHT
37 ~ 54
RED – BLU
RED – YLW
Normal (Ω)
MUZ-DW50VF
1.59 ~ 2.16
0.82 ~ 1.11
Normal (Ω)
MUZ-DW50VF
15 ~ 20
35
Figure
WHT
RED BLK
W
V
U
WHT
RED BLK
W
V
U
WHT
LEV
ORN
RED
(+12V)
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