Mitsubishi Electric City Multi PLFY Series, Technical & Service Manual, Page: 22 / 40

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TROUBLE SHOOTING
8
8-1. HOW TO CHECK THE PARTS
PLFY-P20VEM-E.UK PLFY-P25VEM-E.UK PLFY-P32VEM-E.UK PLFY-P40VEM-E.UK
PLFY-P50VEM-E.UK PLFY-P63VEM-E.UK PLFY-P80VEM-E.UK PLFY-P100VEM-E.UK
PLFY-P125VEM-E.UK
Parts name Check points
Disconnect the connectors, then measure the resistance with a tester.
(At ambient temperatures of 10 to 30
:
)
Measure the resistance between the terminals with a tester.
Drain pump (DP)
i-see Sensor
Drain float switch (FS)
(Refer to “8-1-1. Thermistor”.)
Room temperature
detection thermistor (TH21)
Pipe temperature detection
thermistor/liquid (TH22)
Pipe temperature detection
thermistor/gas (TH23)
Normal
4.3–9.6 k
"
Abnormal
Open or short
State of moving part Abnormal
DOWN Other than open
UP
Normal
Open
Short Other than short
Measure the resistance between the terminals with a tester.
(At ambient temperatures of 20 to 30
:
)
Vane motor (MV)
i-see Sensor motor
(MT) (Option)
Abnormal
Open or short
Red - Yellow (
5
-
3
,
0
-
8
,
5
-
3
,
)
-
8
)
Red - Blue (
5
-
1
,
0
-
6
,
5
-
1
,
)
-
6
)
Red - Orange (
5
-
4
,
0
-
9
,
5
-
4
,
)
-
9
)
Red - White (
5
-
2
,
0
-
7
,
5
-
2
,
)
-
7
)
Connector
Normal
300
"
Measure the resistance between the terminals with a tester.
(At ambient temperatures of 20 to 30°C)
Abnormal
Open or short
Red - Yellow
Red - Blue
Red - Orange
Red - White
Connector Normal
250
"
Abnormal
White-Red
Yellow-Brown
Orange-Red
Blue-Brown
Connector Normal
Disconnect the connector then measure the resistance valve with a tester.
(At the coil temperatures of 10 to 30°C)
Linear expansion
valve (LEV)
Refer to “8-1-2. Linear expansion valve”.
Red
Purple
Black
1
Check if the drain float switch works properly.
2
Check if the drain pump works and drains water properly in cooling operation.
3
If no water drains, confirm that the check code 2502 will not be displayed 10 minutes after the
operation starts.
Note: The drain pump for this model is driven by the internal DC motor of controller board, so it is not
possible to measure the resistance between the terminals.
Normal
Red– Black: Input 13 V DC → The fan starts to rotate.
Purple–Black: Abnormal (check code 2502) if it outputs 0–13 V square wave (5 pulses/rotation),
and the number of rotation is not normal.
200
"
± 10% Open or short
2
1
Moving part
4
3
Switch
Magnet
Moving part
Yellow
Blue
Red
Orange
White
Yellow
Blue
Red
Orange
White
1 2 3 4
1 2 3 4
Black Black Black Black
Turn the power ON while the i-see Sensor connector is connected to the CN4Z on indoor
controller board. A communication between the indoor controller board and i-see Sensor
board is made to detect the connection.
Normal: When the operation starts, the motor for i-see Sensor is driven to rotate the i-see Sensor.
Abnormal: The motor for i-see Sensor is not driven when the operation starts.
Note: The voltage between the terminals cannot be measured accurately since it is pulse output.
1
2
3
LEV
Brown
CN60
Blue
1
2
3
4
5
6
Orange
White
Red
Yellow
OCH657