Mitsubishi Electric MUZ-FS06NAH-U1 Service Manual page 32

10-4. TROUBLESHOOTING CRITERION OF MAIN PARTS
MUZ-FS06NA MUZ-FS06NAH MUZ-FS09NA MUZ-FS09NAH MUZ-FS12NA MUZ-FS12NAH
MUZ-FS15NA MUZ-FS15NAH MUZ-FS18NA MUZ-FS18NAH
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
OBH873A
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-FS06/09
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-FS06/09/12
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 Normal (Ω)
RED – ORN
RED – WHT
RED – BLU
RED – YLW
Measure the resistance using a tester.
[Temperature: 14 - 104°F (-10 - 40°C)]
Normal (Ω)
MUZ-FS06/09/12NAH
349 - 428
Normal (Ω)
MUZ-FS12 MUZ-FS15/18
1.66 - 2.26 0.87 - 1.18
Normal (Ω)
MUZ-FS15/18
29 - 37 8 - 10
37 - 54
MUZ-FS15/18NAH
376 - 461
32
Figure
WHT RED BLK
W
V
U
WHT RED BLK
W
V
U
WHT
LEV
ORN
RED
(+12V)