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Part name
Check method and criterion
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 11-7. "TEST POINT DIAGRAM AND VOLTAGE" 1. "Inverter P.C. board", 2.
"Outdoor control P.C. board " or 3. "Outdoor power P.C. board" for the chart of thermis-
tor.
Discharge temperature thermistor
(RT62)
Measure the resistance with a tester.
Before measurement, hold the thermistor with your hands to warm it up.
Refer to 11-7. "TEST POINT DIAGRAM AND VOLTAGE" 1. "Inverter P.C. board", 2.
"Outdoor control P.C. board ", for the chart of thermistor.
Compressor
Measure the resistance between terminals with a tester.
(Winding temperature : -10 °C ~ 40 °C)
Normal (Each phase)
MXZ-2HJ40VA
MXZ-3HJ50VA
1.49 ~ 1.84
0.86 ~ 1.06
Outdoor fan motor
MXZ-2HJ40VA
Measure the resistance between lead wires with a tester.
(Part temperature : -10 °C ~ 40 °C)
Normal (Each phase)
MXZ-2HJ40VA
12 ~ 16
Outdoor fan motor
MXZ-3HJ50VA
MXZ-3HJ50VA
Refer to 11-6. .
R.V. coil
Measure the resistance with a tester. (Part temperature : -10 °C ~ 40 °C)
Normal
MXZ-2HJ40VA
MXZ-3HJ50VA
1.2 k ~ 1.56 k
1.26 k ~ 1.62 k
Linear expansion valve
Measure the resistance with a tester. (Part temperature : -10 °C ~ 40 °C)
Color of lead wire
Normal
WHT - RED
37.4 ~ 53.9
RED - ORN
YLW - RED
RED - BLU
High pressure switch (HPS)
MXZ-3HJ50VA
MXZ-3HJ50VA
Pressure
Normal
HPS
3.43 0.15 MPa
Close
4.41 0.10 MPa
Open
W
U
V
WHT
RED
BLK
LEV
WHT
RED
YLW
ORN
BLU
11-5. TROUBLE CRITERION OF MAIN PARTS
MXZ-2HJ40VA MXZ-3HJ50VA
2
3
W
U
V
1
WHT
RED BLK
OBH709A
