37
12-4. TROUBLE CRITERION OF MAIN PARTS
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 12-6. “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 12-6. “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-EF25/35VG(H) MUZ-EF42/50VG
U-V
U-W
V-W
1.59 ~ 2.16
0.82 ~ 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-EF25/35/42VG
MUZ-EF25/35VGH
MUZ-EF50VG
RED – BLK
BLK – WHT
WHT – RED
32 ~ 43
15 ~ 20
W
U
V
WHT
RED BLK
R. V. coil (21S4)
Measure the resistance using a tester. (Temperature: -10 ~ 40°C)
Normal (k
Ω
)
1.41 ~ 2.00
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•VGH
Normal (
Ω
)
MUZ-EF25/35VGH
802 ~ 980
OBH832
