39
11-4. TROUBLE CRITERION OF MAIN PARTS
MUZ-EF25VE MUZ-EF25VEH MUZ-EF35VE MUZ-EF35VEH MUZ-EF42VE MUZ-EF50VE
Part name
Check method and criterion
Figure
Defrost thermistor (RT61)
Fin temperature
thermistor (RT64)
Ambient temperature
thermistor (RT65)
Outdoor heat exchanger
temperature thermistor
(RT68)
Measure the resistance with a tester.
Refer to 11-6. “Test point diagram and voltage”, 1. “Inverter P.C.
board”, for the chart of thermistor.
Discharge temperature
thermistor (RT62)
Measure the resistance with a tester. Before measurement, hold the
thermistor with your hands to warm it up.
Refer to 11-6. “Test point diagram and voltage”, 1. “Inverter P.C.
board”, for the chart of thermistor.
Compressor
Measure the resistance between terminals using a tester.
(Temperature: -10 ~ 40°C)
Normal (
Ω
)
MUZ-EF25
MUZ-EF35/42
MUZ-EF50
U-V
U-W
V-W
1.36 ~ 1.93
1.52 ~ 2.17
0.78 ~ 1.11
W
U
V
WHT
RED BLK
Outdoor fan motor
Measure the resistance between lead wires using a tester.
(Temperature: -10 ~ 40°C)
Color of lead wire
Normal (
Ω
)
MUZ-EF25/35/42
MUZ-EF50
RED – BLK
BLK – WHT
WHT – RED
29 ~ 42
12 ~ 17
W
U
V
WHT
RED BLK
R. V. coil (21S4)
Measure the resistance using a tester. (Temperature: -10 ~ 40°C)
Normal (k
Ω
)
1.19 ~ 1.78
Expansion valve coil
(LEV)
Measure the resistance using a tester. (Temperature: -10 ~ 40°C)
Color of lead wire
Normal (
Ω
)
RED – ORN
37 ~ 54
RED – WHT
RED – BLU
RED – YLW
RED
(+12V)
YLW
BLU
WHT
ORN
LEV
Defrost heater
MUZ-EF•VEH
Measure the resistance using a tester.
(Temperature: -10 ~ 40°C)
Normal (
Ω
)
349 ~ 428
OBH590G
