Mitsubishi Electric TRANE NTXCKS09A112AA, Technical & Service Manual

Page: 26 / 36

26
OCHT669
8-7. TROUBLESHOOTING OF MAIN PARTS
Drain float switch (FS)
2
1
Moving part
4
3
Measure the resistance between the terminals with a tester.
State of moving part Abnormal
DOWN Other than open
UP
Normal
Open
Closed Other than short
Switch
Magnet
Moving
Part
i-see Sensor *
i-see Sensor motor *
Orange
Red
White
Blue Yellow
M
Measure the resistance between the terminals with a tester.
(At the ambient temperature 68 to 86°F)
(Refer to "8-7-1. Thermistor Characteristic Graph")
Room temperature
thermistor (TH1)
Condenser/evaporator
temperature thermistor (TH5)
Measure the resistance with a tester.
(Parts temperature 50 to 86°F)
Pipe temperature
thermistor/liquid (TH2)
Check method and criterion Parts name
Normal
4.3 to 9.6 k
"
Measure the resistance between the terminals with a tester.
(At the ambient temperature 68 to 86°F)
Vane motor (MV)
Drain pump (DP)
Normal Connector
300
"
±
7%
(at 77°F)
Orange
Red
White
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
)
Blue
Yellow
M
1
2
3
Red
Purple
Black
1
Check if the drain float switch works properly.
2
Check if the drain pump works and drains water properly in dry mode.
3
If no water drains, confirm that the check code P5 will be displayed 10 minutes after the
operation starts.
Note: The DC volt drain pump motor for this model is driven by the control board, so it is not possible
to measure resistance between the wires leading to the pump motor.
Normal
Red– Black: Input 13 V DC → The pump starts to rotate.
Purple–Black: Abnormal (check code P5) if it outputs 0–13 V square wave (5 pulses/rotation), and
the number of rotation is not normal.
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.
* i-see Sensor is available with optional “i-see Sensor corner panel” (TLP-18FAEU).
250
"
± 7% (at 77°F)
Normal
Red–Yellow Red–Blue Red–Orange Red–White
NTXCKS09A112AA NTXCKS12A112AA NTXCKS15A112AA NTXCKS18A112AA