Sharp AU-A129E - Compressor and Thermistor Troubleshooting; Room Not Cooled Diagnosis

AH-A129E
AU-A129E
22
The room is not cooled.
The compressor does not operate.
Measure resistances of TH1 and TH2.
The control circuit is normal.
The compressor may be defective.
The running capacitor may be defective.
Refrigerant may have leaked.
The outdoor fan motor may be defective.
The outdoor fan motor capacitor may be defective.
Push the button "TEST" on the 
indoor unit, and wait 3 minutes.
Is there a voltage
between terminal "N" and
"1" of the terminal board the
power supply voltage ?
Are the resistances
correct Fig. 1 ?
Replace the thermistor ass'y with a new one.
NO
YES
YES
NO
Replace the PWB ass'y with a new one.
0
20
40
60
80
100
120
140
160
180
0 10 20 30 40˚C-10
CHARACTERISTIC OF TH1 & TH2
Fig. 1
Using a meter, measure voltage at
the terminals on the terminal board.
K
10˚C
30K