Mitsubishi Electric Mr.SLIM PLA-SM71EA Service Manual page 31

9-6. HOW TO CHECK THE PARTS
PLA-SM71EA.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
OCH683
PLA-SM100EA.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
PLA-SM125EA.UK
Check method and criterion
Abnormal
Opened or short-circuited
Normal
300 "
Abnormal
Other than short
Other than open
31
PLA-SM140EA.UK
Abnormal
Open or short
Switch
Magnet
Moving
Part