AY-A244 - Sharp Air Conditioner Specification (repair manual). Page 20

20

The room is not cooled at all
or 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 be leaked.
   The outdoor fan motor may be defective.
   The outdoor fan motor capacitor may be defective.

Push the button "TEST RUN" on  
the indoor unit, and wait 3 minutes.

Is the voltage

between terminal "N" and

"1" of the terminal board the

power supply voltage ?

Are the resistances

conformed 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

K

0

10

20

30 40˚C

-10

CHARACTERISTIC OF TH1 & TH2

10˚C
30K 

Using a tester, measure voltage at
the terminals on the terminal board.