Mitsubishi Electric MUZ-EF25VE - E1 Service Manual page 34

11-4. TROUBLE CRITERION OF MAIN PARTS
MUZ-EF25VE MUZ-EF25VEH MUZ-EF35VE MUZ-EF35VEH MUZ-EF42VE MUZ-EF50VE
Part name
Defrost thermistor (RT61)
Fin temperature
thermistor (RT64)
Ambient temperature
thermistor (RT65)
Outdoor heat exchanger
temperature thermistor
(RT68)
Discharge temperature
thermistor (RT62)
Compressor
Outdoor fan motor
R. V. coil (21S4)
Expansion valve coil
(LEV)
Defrost heater
MUZ-EF•VEH
OBH590B
Check method and criterion
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.
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.
Measure the resistance between terminals using a tester.
(Temperature: -10 ~ 40°C)
MUZ-EF25
U-V
U-W 1.36 ~ 1.93
V-W
Measure the resistance between lead wires using a tester.
(Temperature: -10 ~ 40°C)
Color of lead wire
MUZ-EF25/35/42
RED – BLK
BLK – WHT
WHT – RED
Measure the resistance using a tester. (Temperature: -10 ~ 40°C)
Normal (kΩ)
1.19 ~ 1.78
Measure the resistance using a tester. (Temperature: -10 ~ 40°C)
MUZ-EF25/35/42
Color of lead wire
WHT – RED
RED – ORN
YLW – BRN
BRN – BLU
Measure the resistance using a tester. (Temperature: -10 ~ 40°C)
MUZ-EF50
Color of lead wire
RED – ORN
RED – WHT
RED – BLU
RED – YLW
Measure the resistance using a tester.
(Temperature: -10 ~ 40°C)
Normal (Ω)
349 ~ 428
Normal (Ω)
MUZ-EF35/42 MUZ-EF50
1.52 ~ 2.17 0.78 ~ 1.11
Normal (Ω)
MUZ-EF50
29 ~ 42 12 ~ 17
Normal (Ω)
37 ~ 54
Normal (Ω)
37 ~ 54
34
Figure
WHT
RED BLK
W
V
U
WHT RED BLK
W
V
U
WHT
RED LEV
ORN
WHT
LEV
ORN
RED
(+12V)