Troubleshooting Criterion Of Main Parts; Measure The Resistance With A Tester - Mitsubishi Electric MUZ-FS06NA Service Manual

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)

Measure the resistance with a tester.

Refer to 10-6. "Test point diagram and voltage", 1. "Inverter P.C.
Fin temperature
board", for the chart of thermistor.
thermistor (RT64)
Ambient temperature
thermistor (RT65)
Outdoor heat exchanger
temperature thermistor
(RT68)
Measure the resistance with a tester. Before measurement, hold the
thermistor with your hands to warm it up.
Discharge temperature
thermistor (RT62)
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)]
Compressor
Measure the resistance between lead wires using a tester.
[Temperature: 14 - 104°F (-10 - 40°C)]
Outdoor fan motor
Measure the resistance using a tester.
[Temperature: 14 - 104°F (-10 - 40°C)]
R. V. coil (21S4)
Measure the resistance using a tester.
[Temperature: 14 - 104°F (-10 - 40°C)]
Expansion valve coil
(LEV)
Measure the resistance using a tester.
[Temperature: 14 - 104°F (-10 - 40°C)]
Defrost heater
OBH873
Check method and criterion
MUZ-FS06/09
U-V
U-W 1.60 - 2.17
V-W
Color of lead wire
MUZ-FS06/09/12
RED – BLK
BLK – WHT 29 - 37
WHT – RED
Normal (kΩ)
0.97 - 1.38
Color of lead wire Normal (Ω)
RED – ORN
RED – WHT
37 - 54
RED – BLU
RED – YLW
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
8 - 10
MUZ-FS15/18NAH
376 - 461
32
Figure
WHT RED BLK
W
V
U
WHT RED BLK
W
V
U
WHT
LEV
ORN
RED
(+12V)