Mitsubishi Electric Mr.Slim MUZ-FD09NA Service Manual page 22

10-4. TROUBLE CRITERION OF MAIN PARTS
MUZ-FD09NA MUZ-FD12NA
Part name
Defrost thermistor
(RT61)
Measure the resistance with a tester.
Ambient temperature
thermistor (RT65)
Refer to 10-6. "Test point diagram and voltage", 1. "Inverter P.C.
board", the chart of thermistor.
Outdoor heat ex-
changer temperature
thermistor (RT68)
Discharge tem-
Measure the resistance with a tester. Before measurement, hold the
perature thermistor
thermistor with your hands to warm it up.
(RT62)
Refer to 10-6. "Test point diagram and voltage", 1. "Inverter P.C.
Fin temperature
board", the chart of thermistor.
thermistor (RT64)
Measure the resistance between terminals using a tester.
(Winding temperature : -4 ~ 104°F (-20 ~ 40°C))
Compressor
Measure the resistance between lead wires using a tester.
(Part temperature : 14 ~ 104°F (-10 ~ 40°C))
Outdoor fan motor
Measure the resistance using a tester.
(Part temperature : 14 ~ 104°F (-10 ~ 40°C))
R. V. coil (21S4)
Measure the resistance using a tester.
(Part temperature : 14 ~ 104°F (-10 ~ 40°C))
Expansion valve coil
(LEV)
Check method and criterion
Normal
U-V
U-W 1.52 ~ 2.17 Ω
V-W
Color of lead wire
RED – BLK
BLK – WHT
WHT – RED
Normal
970 ~ 1380 Ω
Color of lead wire
WHT – RED
RED – ORN
YLW – BRN
BRN – BLU
Normal
11 ~ 16 Ω
Normal
37 ~ 54 Ω
22
Figure
WHT RED BLK
2 3
1
W
V
U
WHT RED BLK
2 3
1
W
V
U
WHT
LEV
RED
ORN