Troubleshooting - Mitsubishi Electric PLFY-P20VBM-E.UK Technical & Service Manual

9

TROUBLESHOOTING

9-1. HOW TO CHECK THE PARTS
PLFY-P20/25/32/40/50/63/80/100/125VBM-E.UK
PLFY-P32/40/50/63/80/100/125VBM-ER2.UK
Parts name
Room temp. detection Disconnect the connector then measure the resistance with a tester.
thermistor (TH21) (At the ambient temperature of 10 to 30:)
Pipe temp. detection
thermistor/ liquid(TH22)
Pipe temp. detection
4.3 to 9.6 k"
thermistor/ gas (TH23)
Vane motor (MV)
Measure the resistance between the terminals with a tester.
(At the ambient temperature of 20 to 30:)
White
MV
Red - Yellow
Orange Red - Blue
Red - Orange (5-4, 0-9, 5-4, )-9)
Red
Yellow Red - White
Blue
Drain pump (DP)
Measure the resistance between the terminals with a tester.
(Winding temperature 20:)
YLW
1
3
YLW
Drain float switch (FS)
Measure the resistance between the terminals with a tester.
Moving part
State of moving part
1
2
3
4
i-see sensor
Turn on the indoor unit with the black plastic tape on the outside of i-see sensor controller board.
(Option)
With electricity being turned on, measure the power voltage between connectors with tester.
i-see sensor rotates and pull out the connector of motor for i-see sensor.
4 3 2 1
i-see sensor (At the ambient temperature of 10 to 40:)
i-see sensor connector
4 3 2 1
Blue BlackPink Brown
NOTE : Be careful not to discharge static electricity into electronics.
Measure the resistance between the terminals with a tester.
Vane motor for
(At the ambient temperature of 20 to 30:)
i-see sensor (Option)
White
Connector
Red - Yellow
MV
Red - Blue
Orange
Red - Orange
Red
Red - White
Yellow
Blue
Linear expansion
Disconnect the connector then measure the resistance valve with a tester.
valve(LEV)
Blue
Brown
M
White-Red
Yellow
Refer to "9-1-2. Linear expansion valve".
White
Red
Orange
OCH413E
Normal Abnormal
Open or short
Connector
(5-3, 0-8, 5-3, )-8)
(5-1, 0-6, 5-1, )-6)
(5-2, 0-7, 5-2, )-7)
Normal Abnormal
290 " Open or short
Normal
UP Short
DOWN Open
Black plastic tape
1.857 to 3.132 V DC
2(–)—4(+)
0.939 to 1.506 V DC
1(+)—2(–)
Normal
250 "
Normal
Yellow-Brown Orange-Red
200 " i10%
PLFY-P32/40/50/63/80VBM-E
PLFY-P32/40/50/63/80/100/125VBM-ER3.UK
Check points
(Refer to "9-1-1. Thermistor" .)
Normal
300 "
Abnormal
Other than short
Other than open
Do not disassemble corner panel
with i-see sensor.
Normal Abnormal
Other than the normal
Other than the normal
Abnormal
Open or short
Abnormal
Blue-Brown
Open or short
26
.UK
1
Abnormal
Open or short
Switch
Magnet
Moving
Part