AirStage AO54FJ, Service Manual

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Trouble shooting 18
OUTDOOR UNIT OUTDOOR UNIT Error Method: Error Method:
Discharge temperature
Thermistor Abnormal
Detective Actuators: Detective Actuators:
Discharge temperature Thermistor
Open or Short
Detective details: Detective details:
When thermistor open or short detected during the compressor is in
operation, the compressor stops, indicates error and output the error
information to the network.
Forecast of Cause Forecast of Cause:
1. Connector wiring defective
2. Thermistor defective
3. Control PCB defective
Check Point 1 : Check Point 1 :
Checking wiring of Connector CN21 Checking wiring of Connector CN21
Loose connector
Incorrect wiring
Thermistor cable is cut off
When reworking on the loose connector, erroneous connection, keep the power shut off.
Check Point 2 : Remove CN21, measure the thermistor resistance Check Point 2 : Remove CN21, measure the thermistor resistance
Thermistor characteristics (Approx)
If its open or short, replace the thermistor and turn on the main power.
Check Point 3 : Check control PCB CN21 Voltage DC 5.0V Check Point 3 : Check control PCB CN21 Voltage DC 5.0V
If CN21 voltage can not be measured, replace Control PCB.
12.5
60
18.1
50
26.9
40
8.8
70
41.1 64.5 81.8 105 135 176 Resistance Value ( ) k
30 20 15 10 5 0 Temperature ( )
0.5
180
0.8
160
1.2 2.0 3.4 4.6 6.3 Resistance Value ( ) k
140 120 100 90 80 Temperature ( )
P/No.
9704219107
(Discharge temperature thermistor)
Indicate or Display: Indicate or Display:
Indoor Unit : Operation LED Flash Flash , , Timer LED 3 Times Blink 3 Times Blink
Swing LED 3 Times Blink 3 Times Blink
Outdoor Unit : LED1 Flash Flash , , LED3 1 1 Time Blink Time Blink
ERROR CODE: E:32
06-22
HEX OUTLET TEMP THERMISTOR
HEX CENTER TEMP THERMISTOR
DC5V
CN21
CN22
CN24
CN25
CN26
YELLOW
BLUE
RED
RED
1
2
1
2
1
2
1
2
1
2
BROWN
BROWN
BLUE
BLUE
GREEN
GREEN
BLACK
BLACK
BLACK
BLACK
DISCHARGED TEMP THERMISTOR
SUCTION TEMP THERMISTOR
OUTDOOR TEMP THERMISTOR