Obh629A - Mitsubishi Electric MUZ-SF25VE-E1 Service Manual

11-4. TROUBLE CRITERION OF MAIN PARTS
MUZ-SF25VE MUZ-SF25VEH MUZ-SF35VE MUZ-SF35VEH
MUZ-SF42VE MUZ-SF42VEH MUZ-SF50VE MUZ-SF50VEH
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-SF•VEH

OBH629A

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-SF25 MUZ-SF35 MUZ-SF42 MUZ-SF50
U-V
U-W 1.20 ~ 1.72 1.36 ~ 1.93 1.52 ~ 2.17 0.78 ~ 1.11
V-W
Measure the resistance between lead wires using a tester.
(Temperature: -10 ~ 40°C)
Color of lead wire
MUZ-SF25/35/42
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-SF25/35/42
Color of lead wire
WHT – RED
RED – ORN
YLW – BRN
BRN – BLU
Measure the resistance using a tester. (Temperature: -10 ~ 40°C)
MUZ-SF50
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)
Normal (Ω)
MUZ-SF50
29 ~ 42 12 ~ 17
Normal (Ω)
37 ~ 54
Normal (Ω)
37 ~ 54
33
Figure
WHT RED BLK
W
V
U
WHT
RED BLK
W
V
U
WHT
RED LEV
ORN
WHT
LEV
ORN
RED
(+12V)