Mitsubishi Electric PLA-A12EA8 Service Manual page 26

9-6. HOW TO CHECK THE PARTS
PLA-A12EA8
PLA-A36EA8
Parts name
Room temperature Disconnect the connector then measure the resistance with a tester.
thermistor (TH1) (At the ambient temperature of 50 to 86˚F [10 to 30˚C])
Pipe temperature
thermistor/liquid(TH2)
Condenser/Evaporator
Refer to "9-6-1. Thermistor".
temperature thermistor
(TH5)
Vane motor (MV) Measure the resistance between the terminals with a tester.
(At the ambient temperature of 68 to 86˚F [20 to 30˚C])
White
Orange
Red
Yellow
Blue
Drain pump (DP)
1 Check if the drain float switch works properly.
2 Check if the drain pump works and drains water properly in cooling operation.
1 Red
3 If no water drains, confirm that the check code P5 will not be displayed 10 minutes after the
2 Purple
Black
3
Note: The drain pump for this model is driven by the internal DC motor of controller board, so it is not
Normal
Red–Black: Input 13 V DC → The motor starts to rotate.
Purple–Black: Abnormal (check code P5) if it outputs 0–13 V square wave (5 pulses/rotation),
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 (Option)
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.
1 2 3 4
Note: The voltage between the terminals cannot be measured accurately since it is pulse output.
1 2 3 4
Vane motor for Measure the resistance between the terminals with a tester.
(At the ambient temperature of 68 to 86˚F [20 to 30˚C])
i-See sensor (Option)
White
Orange
Red
Yellow
Blue
TCH120A
PLA-A18EA8
PLA-A42EA8
Normal Abnormal
Opened or short - circuited
4.3 to 9.6 kΩ
Connector
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)
operation starts.
possible to measure the resistance between the terminals.
and the number of rotation is not normal.
Normal
UP Short
DOWN Open
Connector Normal
Red - Yellow
Red - Blue
250 " ± 7%
Red - Orange
Red - White
PLA-A24EA8
PLA-A48EA8
Check points
Normal
300 " ± 7%
Abnormal
Other than short
Other than open
Abnormal
Open or short
26
PLA-A30EA8
Abnormal
Open or short
Switch
Magnet
Moving part