Trouble Criterion Of Main Parts - Mitsubishi Electric MUZ-FH09NA Service Manual

10-4. TROUBLE CRITERION OF MAIN PARTS

MUZ-FH09NA MUZ-FH09NAH
MUZ-FH12NA MUZ-FH12NAH
MUZ-FH15NA MUZ-FH15NAH
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
OBH584A
Check method and criterion
Measure the resistance with a tester.
Refer to 10-6. "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 10-6. "Test point diagram and voltage", 1. "Inverter P.C.
board", for the chart of thermistor.
Measure the resistance between terminals using a tester.
[Temperature: 14 ~ 104°F (-10 ~ 40°C)]
MUZ-FH09
U-V
U-W 1.60 ~ 2.17
V-W
Measure the resistance between lead wires using a tester.
[Temperature: 14 ~ 104°F (-10 ~ 40°C)]
Color of lead wire
MUZ-FH09/12
RED – BLK
BLK – WHT
WHT – RED
Measure the resistance using a tester.
[Temperature: 14 ~ 104°F (-10 ~ 40°C)]
Normal (kΩ)
0.97 ~ 1.38
Measure the resistance using a tester.
[Temperature: 14 ~ 104°F (-10 ~ 40°C)]
Color of lead wire
RED – ORN
RED – WHT
RED – BLU
RED – YLW
Measure the resistance using a tester.
[Temperature: 14 ~ 104°F (-10 ~ 40°C)]
Normal (Ω)
MUZ-FH09/12NAH
349 ~ 428
Normal (Ω)
MUZ-FH12 MUZ-FH15
1.66 ~ 2.26 0.87 ~ 1.18
Normal (Ω)
MUZ-FH15
29 ~ 40 12 ~ 16
Normal (Ω)
37 ~ 54
MUZ-FH15NAH
376 ~ 461
30
Figure
WHT RED BLK
W
V
U
WHT RED BLK
W
V
U
WHT
LEV
ORN
RED
(+12V)