Trouble Criterion Of Main Parts - Mitsubishi Electric MUZ-AP25VG - E1 Service Manual

12-4. TROUBLE CRITERION OF MAIN PARTS

Part name
Defrost thermistor (RT61)
Fin temperature
thermistor (RT64)
Measure the resistance with a tester.
Ambient temperature
Refer to 12-6. "Test point diagram and voltage", 1. "Inverter P.C.
thermistor (RT65)
board", for the chart of thermistor.
Outdoor heat exchanger
temperature thermistor
(RT68)
Measure the resistance with a tester. 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 tester.
(Temperature: -10 ~ 40°C)
Compressor
Measure the resistance between lead wires using a tester.
(Temperature: -10 ~ 40°C)
Outdoor fan motor
Measure the resistance using a tester. (Temperature: -10 ~ 40°C)
R. V. coil (21S4)
Measure the resistance using a tester. (Temperature: -10 ~ 40°C)
Expansion valve coil
(LEV)
Defrost heater
MUZ-AP•VGH
OBH789
Check method and criterion
Normal (Ω)
MUZ-AP25/35VG(H) MUZ-AP42/50VG(H)
U-V
U-W 1.59 ~ 2.16
V-W
Color of lead wire
MUZ-AP25/35/42VG(H) MUZ-AP50VG(H)
RED – BLK
BLK – WHT 32 ~ 43
WHT – RED
Normal (kΩ)
1.41 ~ 2.00
Color of lead wire Normal (Ω)
RED – ORN
RED – WHT
37 ~ 54
RED – BLU
RED – YLW
Normal (Ω)
MUZ-AP25/35/42VGH
802 ~ 980
0.82 ~ 1.11
Normal (Ω)
15 ~ 20
MUZ-AP50VGH
370 ~ 428
38
Figure
WHT RED BLK
W
V
U
WHT RED BLK
W
V
U
WHT
LEV
ORN
RED
(+12V)