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9
TROUBLESHOOTING
Parts name
Room temperature
Disconnect the connector then measure the resistance with a multimeter.
detection thermistor (TH21)
(At the ambient temperature 50 to 86°F)
Pipe temperature detection
thermistor/inlet (TH22)
Pipe temperature detection
4.3 to 9.6 kΩ
thermistor/outlet (TH23)
Vane motor (MV)
Measure the resistance between the terminals with a multimeter. (At the ambient temperature 77°F)
7
Yellow
M
10
9
Red
Brown-Red
Brown
10
Green
Orange
Connector(CNV)
6
8
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
Note: The drain pump for this model is driven by the internal DC motor, so it is not possible to
2
VT
3
BK
Normal
(Optional parts)
Red–Black: Input 13 VDC → The pump motor starts to rotate.
Drain float
Measure the resistance between the terminals with a multimeter.
switch (FS)
State of moving part
Moving part
1
2
3
(Optional parts)
4
TCH121
Abnormal
Normal
Open or short
Normal
-
-
10
10
Brown-Orange
Brown-Yellow
300 Ω ±7%
Normal
1-5
2-5
Orange-Blue
Red-Blue
55 Ω ±5.6 Ω (at 77°F）
measure the resistance between the terminals.
Normal
Short
UP
Open
DOWN
Short
–
Checkpoints
Refer to "9-1-1. Thermistor".
Abnormal
-
-
10
Brown-Green
Open or short
Abnormal
3-5
4-5
Green-Blue
Open or short
Drain float switch
Abnormal
connector terminal
Other than short
(+) –
Other than open
(+) –
(+) –
Other than short
17
Switch
Magnet
(-)
(-)
(-)
Moving
Part
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