Mitsubishi Electric SUZ-SWM40VA Technical & Service Manual page 21

10-3. HOW TO PROCEED "SELF-DIAGNOSIS"
Refer to "TROUBLE SHOOTING" of the indoor unit service manual.
10-4. TROUBLE CRITERION OF MAIN PARTS
SUZ-SWM40VA.TH
SUZ-SWM60VA.TH
SUZ-SWM80VA.TH
Parts name
Defrost thermistor (RT61)
Fin temperature
thermistor (RT64)
Ambient temperature
thermistor (RT65)
Outdoor heat exchanger
temperature thermistor(RT68)
Discharge temperature
thermistor (RT62)
Compressor
Outdoor fan motor
R.V. coil (21S4)
Expansion valve coil
(LEV)
OCH718A
Check method and criterion
Measure the resistance with a tester.
Refer to "10-6. Test point diagram and voltage" for the chart of thermistor.
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" for the chart of thermistor.
Measure the resistance between terminals with a tester.
(Temperature: −10 to 40°C)
SUZ-SWM40
U-V
U-W 0.82 to 1.11 Ω
V-W
Measure the resistance between terminals with a tester.
(Temperature: −10 to 40°C)
Color of the lead wire
WH - BK
BK - RD
RD - WH
Measure the resistance between terminals with a tester.
(Temperature: −10 to 40°C)
Normal
1.17 to 1.66 kΩ
Measure the resistance with a tester.
(Temperature: −10 to 40°C)
Color of the lead wire
RD - OG
RD - WH
RD - BU
RD - YE
Normal
SUZ-SWM60/80
0.87 to 1.18 Ω
Normal
25 to 34 Ω
Normal
37 to 54 Ω
21
Figure
WH RD BK
W
V
U
WH RD BK
W
V
U
WH
LEV
OG
RD
YE BU