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Sharp AY-A079E Service Manual page 19

Split system room air conditioners
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The room is not cooled at all
or not cooled.
The compressor does not operate.
Push the button "TEST RUN" on
the indoor unit, and wait 3 minutes.
Using a tester, measure voltage at
the terminals on the terminal board.
Is the voltage
between terminal "N" and
"1" of the terminal board the
power supply voltage ?
YES
Measure resistances of TH1 and TH2.
Are the resistances
conformed Fig. 1 ?
YES
The control circuit is normal.
The compressor may be defective.
The running capacitor may be defective.
Refrigerant may be leaked.
The outdoor fan motor may be defective.
The outdoor fan motor capacitor may be defective.
CHARACTERISTIC OF TH1 & TH2
K
180
160
140
120
100
80
60
40
20
0
-10
0
10
NO
Replace the PWB ass'y with a new one.
NO
Replace the thermistor ass'y with a new one.
19
25˚C
15K
20
30 40˚C
Fig. 1
AY/AE-A079E
AY/AE-A099E

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