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11-4. TROUBLE CRITERION OF MAIN PARTS
MUZ-DM25VA MUZ-DM35VA
Part name
Check method and criterion
Figure
Defrost thermistor
(RT61)
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.
Discharge temperature
thermistor (RT62)
Fin temperature thermistor
(RT64)
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.
Compressor (MC)
Measure the resistance between the terminals with a tester.
(Part temperature -10 - 40°C)
Normal
U-V
U-W
V-W
MUZ-DM25VA
MUZ-DM35VA
2.01 - 2.86 Ω
1.20 - 1.72 Ω
Outdoor fan motor (MF)
Measure the resistance between lead wires with a tester.
(Part temperature -10 - 40°C)
Color of lead wire
Normal
RED – BLK
BLK – WHT
WHT – RED
85 - 90 Ω
R.V. coil (21S4)
Measure the resistance between the terminals with a tester.
(Part temperature -10°C - 40°C)
Normal
1.19 - 1.78 kΩ
Expansion valve coil (LEV)
Measure the resistance using a tester.
(Part temperature: -10 - 40°C)
Color of lead wire
Normal
WHT – BRN
37 - 54 Ω
BRN – ORN
YLW – RED
RED – BLU
2
3
W
U
V
1
WHT
RED BLK
2
3
W
U
V
1
WHT
RED BLK
LEV
WHT
BRN
ORN
YL
W
RED
BLU
OBH751
