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9
TROUBLESHOOTING
9-1. HOW TO CHECK THE PARTS
PKFY-WL04NLMU-E.TH
PKFY-WL12NLMU-E.TH
Parts name
Room temperature
Disconnect the connector then measure the resistance with a multimeter.
detection thermistor (TH21)
(At the ambient temperature 50 to 86
Pipe temperature detection
thermistor/liquid (TH22)
Pipe temperature detection
4.3 to 9.6 k
thermistor/gas (TH23)
Vane motor (MV1)
Measure the resistance between the terminals with a multimeter. (At the ambient temperature
Sky Blue
7
M
10
9
Sky Blue
Red-Sky Blue
Red
10
Sky
Sky
Blue
Blue
Connector(CNV)
6
8
pin No.
Vane motor
Measure the resistance between the terminals with a multimeter. (At the ambient temperature
(Lower (MV2))
2
Sky Blue
M
4
Sky Blue
Red-Sky Blue
Red
5
Sky
Sky
Blue
Blue
Connector(CNV)
1
3
pin No.
Fan motor (MF)
Refer to "9-1-3. DC Fan motor (fan motor/indoor controller board)
Flow control valve
Disconnect the connector then measure the resistance between terminals with a multimeter.
(FCV)
CN8A
Refer to the next page for details.
Yellow
1
Orange
2
Red
3
Green
4
M
Blue
5
Yellow-Blue
Purple
6
FCV
(Optional parts)
White
7
Gray
8
Drain pump (DP)
Check if the drain float switch works properly.
Check if the drain pump works and drains water properly in cooling operation.
If no water drains, confirm that the check code 2502 will not be displayed 10 minutes after the operation starts.
1
RD
2
Note: The drain pump for this model is driven by the internal DC motor, so it is not possible to
VT
3
BK
Normal
(Optional parts)
Red–Black: Input 13 VDC → The pump motor starts to rotate.
Measure the resistance between the terminals with a multimeter.
Drain float
switch (FS)
State of moving part
Moving part
1
2
3
(Optional parts)
4
TCH122
PKFY-WL06NLMU-E.TH
PKFY-WL15NLMU-E.TH
Normal
Refer to "9-1-1. Thermistor".
Ω
Normal
-
-
10
10
Red-Sky Blue
Red-Sky Blue
Ω
300
±7%
Normal
-
-
Red-Sky Blue
Red-Sky Blue
Ω
300 ±26.3
Normal
1-5
2-5
Orange-Blue
Red-Blue
Ω
Ω
55
±5.6
(at
measure the resistance between the terminals.
Normal
Short
UP
Open
DOWN
Short
–
Checkpoints
)
°F
-
-
10
Red-Sky Blue
-
-
Red-Sky Blue
Abnormal
3-5
4-5
Green-Blue
Open or short
）
77°F
Drain float switch
Abnormal
connector terminal
Other than short
(+) –
Other than open
(+) –
(+) –
Other than short
20
PKFY-WL08NLMU-E.TH
77°F
77°F
Switch
Magnet
(-)
(-)
(-)
Moving
Part
)
)
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