Mitsubishi Electric PLA-ZP35EA Service Manual page 28

9-6. HOW TO CHECK THE PARTS
PLA-ZP35EA.UK
PLA-ZP71EA.UK
Parts name
Room temperature
thermistor (TH1)
Pipe temperature
thermistor/liquid (TH2)
Condenser/evaporator
temperature thermistor (TH5)
Vane motor (MV)
White
M
Orange
Red
Yellow
Blue
Drain pump (DP)
1 Red
Purple
2
Black
3
Drain float switch (FS)
Moving part
1
2
3
4
i-see Sensor (Option)
1 2 3 4
1 2 3 4
i-see Sensor motor
(Option)
White
M
Orange
Red
Yellow
Blue
OCH625
PLA-ZP50EA.UK
PLA-ZP100EA.UK
Measure the resistance with a tester.
(Parts temperature 10 to 30°C)
Normal
4.3 to 9.6 k"
Refer to "9-6-1 Thermister".
Measure the resistance between the terminals with a tester.
(At the ambient temperature 20 to 30°C)
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)
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 P5 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 motor 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.
Measure the resistance between the terminals with a tester.
State of moving part Normal
UP Short
DOWN Open
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.
Measure the resistance between the terminals with a tester.
(At the ambient temperature 20 to 30°C)
Normal
Red–Yellow Red–Blue
250 "
PLA-ZP60EA.UK
PLA-ZP125EA.UK
Check method and criterion
Abnormal
Opened or short-circuited
Normal
300 "
Abnormal
Other than short
Other than open
Red–Orange Red–White
28
PLA-ZP140EA.UK
Abnormal
Open or short
Switch
Magnet
Moving
Part
Abnormal
Open or short