Mitsubishi Electric MUZ-LN25VG-E1 Service Manual page 58

12-4. TROUBLESHOOTING CRITERION OF MAIN PARTS
MUZ-LN25VG MUZ-LN35VG
MUZ-LN25VG2 MUZ-LN35VG2
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)
OBH767G
MUZ-LN50VG
MUZ-LN50VG2 MUZ-LN60VG2
Check method and criterion
Measure the resistance with a multimeter.
Refer to 12-6. "Test point diagram and voltage", 1. "Inverter P.C.
board", for the chart of thermistor.
Measure the resistance with a multimeter. 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.
Measure the resistance between terminals using a multimeter.
(Temperature: -10 to 40°C)
MUZ-LN25VG MUZ-LN35VG
MUZ-LN25VG2 MUZ-LN35VG2
U-V
U-W 1.59 - 2.16 1.60 - 2.17
V-W
Measure the resistance between lead wires using a multimeter.
(Temperature: -10 to 40°C)
Color of lead wire
MUZ-LN25/35/50VG
MUZ-LN50VG2
RED – BLK
BLK – WHT 15 - 20
WHT – RED
Measure the resistance using a multimeter. (Temperature: -10 to 40°C)
Normal (kΩ)
MUZ-LN25/35/50VG
MUZ-LN25/35/50VG2
1.41 - 2.00
Measure the resistance using a multimeter. (Temperature: -10 to 40°C)
MUZ-LN25/35/50/60VG
MUZ-LN25/35/50VG2
Color of lead wire
RED – ORN
RED – WHT
RED – BLU
RED – YLW
MUZ-LN60VG2
Color of lead wire
BRN – ORN
BRN – WHT
RED – BLU
RED – YLW
MUZ-LN60VG
Normal (Ω)
MUZ-LN50VG MUZ-LN60VG
MUZ-LN50VG2 MUZ-LN60VG2
0.82 - 1.11 0.87 - 1.18
Normal (Ω)
MUZ-LN25/35VG2
32 - 43
MUZ-LN60VG
MUZ-LN60VG2
1.17 - 1.66
Normal (Ω)
37 – 54
Normal (Ω)
37 – 54
58
WHT
V
WHT
MUZ-LN60VG
MUZ-LN60VG2
V
15 - 20
WHT
ORN
RED
(+12V)
Figure
RED BLK
W
U
RED BLK
W
U
LEV