36
10-4. TROUBLE CRITERION OF MAIN PARTS
MUZ-FH06NA MUZ-FH06NAH MUZ-FH09NA MUZ-FH09NAH MUZ-FH12NA MUZ-FH12NAH
MUZ-FH15NA MUZ-FH15NAH MUZ-FH18NA MUZ-FH18NAH MUZ-FH18NA2 MUZ-FH18NAH2
Part name
Check method and criterion
Figure
Defrost thermistor (RT61)
Fin temperature
thermistor (RT64)
Ambient temperature
thermistor (RT65)
Outdoor heat exchanger
temperature thermistor
(RT68)
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.
Discharge temperature
thermistor (RT62)
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.
Compressor
Measure the resistance between terminals using a tester.
[Temperature: 14 - 104°F (-10 - 40°C)]
Normal (
Ω
)
MUZ-FH06/09
MUZ-FH12
MUZ-FH15/18
U-V
U-W
V-W
1.60 - 2.17
1.66 - 2.26
0.87 - 1.18
Outdoor fan motor
Measure the resistance between lead wires using a tester.
[Temperature: 14 - 104°F (-10 - 40°C)]
Color of lead wire
Normal (
Ω
)
MUZ-FH06/09/12
MUZ-FH15/18
RED – BLK
BLK – WHT
WHT – RED
29 - 40
12 - 16
R. V. coil (21S4)
Measure the resistance using a tester.
[Temperature: 14 - 104°F (-10 - 40°C)]
Normal (k
Ω
)
0.97 - 1.38
Expansion valve coil
(LEV)
Measure the resistance using a tester.
[Temperature: 14 - 104°F (-10 - 40°C)]
Color of lead wire
Normal (
Ω
)
RED – ORN
37 - 54
RED – WHT
RED – BLU
RED – YLW
RED
(+12V)
YLW
BLU
WHT
ORN
LEV
Defrost heater
Measure the resistance using a tester.
[Temperature: 14 - 104°F (-10 - 40°C)]
Normal (
Ω
)
MUZ-FH06/09/12NAH
MUZ-FH15/18NAH
MUZ-FH18NAH2
349 - 428
376 - 461
W
U
V
WHT
RED BLK
W
U
V
WHT
RED BLK
OBH684C
