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Mitsubishi Electric PURY-WP200 Service Manual page 225

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[ IX Troubleshooting ]
2. Temperature sensor
1) Connectors on the circuit board are connected to the sensors as follows. Unplug the corresponding connectors before check-
ing each sensor.
Sensor
TH11~TH12
TH13~TH14
TH15~TH16
T31a~T31b
T31c~T31d
T31e~T31f
T31g~T31h
TH32~TH33
TH34
TH35~TH37
2)
Pull out the sensor connector from the I/O board, Do not pull the sensor by holding the lead wire.
Measure the resistance with such as a tester.
Compare the measured value with that of shown in the figure below. When the result is
HWE1113B
Troubleshooting instructions for thermistor
START
Pull out the thermistor connector in
trouble from the board.
Measure the temperature of the thermistor
in trouble. (actual measurement value)
Check the thermistor resistor.
Compare the temperature corresponding to the
resistance measured by the thermistor and the
temperature measured by a commercially
available thermometer, and check whether
there is no difference between them.
Temperature difference
NO
Insert the connector of the thermistor
in trouble into the board, check the sensor
inlet temperature on the LED monitor,
and check the temperature difference.
Temperature difference
NO
Normal
Connectable connector
CN501
CN502
CN511
CN503
CN504
CN508
CN509
CN510
CN505
CN506
Note 1
Note 2
Note 2
YES
Replace the thermistor
Note 3
YES
Check for contact failure.
Replace the control board.
- 216 -
10%, it is normal.
GB
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