Mitsubishi Electric PLA-SM71EA2 Service Manual page 26

9-6. HOW TO CHECK THE PARTS
Parts name
Room temperature
Measure the resistance with a multimeter.
thermistor (TH1) (Parts temperature 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 multimeter.
(At the ambient temperature 20 to 30°C)
White
M
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
Purple
2
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.
Drain float switch (FS)
Measure the resistance between the terminals with a multimeter.
Moving part
1
2
3
4
OCH784
Normal
4.3 to 9.6 k"
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.
State of moving part Normal
UP Short
DOWN Open
Check method and criterion
Abnormal
Opened or short-circuited
Normal
300 "
Abnormal
Other than short
Other than open
26
Abnormal
Open or short
Switch
Magnet
Moving
Part