Mitsubishi Electric PCA-A24KA4 Service Manual page 24

9-6. HOW TO CHECK THE PARTS
PCA-A24KA4 PCA-A30KA4
Parts name
Room temperature
Disconnect the connector then measure the resistance with a tester.
thermistor (TH1)
(At the ambient temperature 50 F~86 F)
Liquid pipe thermistor
(TH2)
Condenser/evaporator
temperature thermistor
(TH5)
Vane motor (MV)
Measure the resistance between the terminals with a tester.
(At the ambient temperature of 68°F~86°F)
White
Orange
Red
Yellow
Blue
Drain pump (DP) (Option) Measure the resistance between the terminals with a tester.
(Winding temperature 68°F)
YLW
1
3
YLW
Drain float switch (FS)
Measure the resistance between the terminals with a tester.
(Option)
Moving part
1
2
3
4
i-see sensor
(Option)
4 3 2 1
i-see sensor (At the ambient temperature of 50°F~104°F)
4 3 2 1
Blue BlackPink Brown
NOTE : Be careful not to discharge static electricity into electronic device.
Measure the resistance between the terminals with a tester.
Vane motor for
(At the ambient temperature of 68°F~86°F)
i-see sensor (Option)
White
Orange
Red
Yellow
Blue
PCA-A36KA4
Normal
4.3k ~9.6k Open or short
Connector
Red - Yellow
Red - Blue
Red - Orange
Red - White
Normal
290 Open or short
State of moving part Normal
UP Short
DOWN Open
Turn on the indoor unit with the black plastic tape on the outside of i-see sensor controller board.
i-see sensor rotates then pull out the connector of motor for i-see sensor.
With electricity being turned on, measure the power voltage between connectors with tester.
Black plastic tape
i-see sensor connector
(–)— (+)
(+)— (–)
Connector
Red - Yellow
Red - Blue
Red - Orange
Red - White
PCA-A42KA4
Check points
Abnormal
(Refer to the next page for a detail.)
Abnormal
Normal
Open or short
300
Abnormal
Abnormal
Other than short
Other than open
Normal
DC 1.857V~ 3.132V
DC 0.939V~ 1.506V
Normal Abnormal
Open or short
250
24
Switch
Magnet
Moving
Part
Abnormal
Other than the normal
Other than the normal