Mitsubishi Electric MUZ-FH25VEHZ Service Manual page 32

11-4. TROUBLE CRITERION OF MAIN PARTS
MUZ-FH25VEHZ
MUZ-FH35VEHZ
MUZ-FH50VEHZ
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
OBH625A
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-FH25/35VEHZ
U-V
U-W 1.66 ~ 2.26
V-W
Measure the resistance between lead wires using a tester.
(Temperature: -10 ~ 40°C)
Color of lead wire
MUZ-FH25/35VEHZ
RED – BLK
BLK – WHT
WHT – RED
Measure the resistance using a tester. (Temperature: -10 ~ 40°C)
Normal (kΩ)
MUZ-FH25/35VEHZ MUZ-FH50VEHZ
1.41 ~ 2.00
Measure the resistance using a tester. (Temperature: -10 ~ 40°C)
Color of lead wire
RED – ORN
RED – WHT
RED – BLU
RED – YLW
Measure the resistance using a tester. (Temperature: -10 ~ 40°C)
Normal (Ω)
MUZ-FH25/35VEHZ MUZ-FH50VEHZ
394 ~ 428
Normal (Ω)
MUZ-FH50VEHZ
0.87 ~ 1.18
Normal (Ω)
MUZ-FH50VEHZ
12 ~ 16 12 ~ 17
1.19 ~ 1.78
Normal (Ω)
37 ~ 54
376 ~ 461
32
Figure
WHT RED BLK
W
V
U
WHT RED BLK
W
V
U
WHT
LEV
ORN
RED
(+12V)