Sharp AH-AP18DR Service Manual page 30

AH/AY-AP18DR
AH/AY-AP24DR
The room is not cooled at all
or not cooled.
The compressor does not operate.
Push the button "AUX." on
the indoor unit, for more than 5 sec.
Using a tester, measure voltage at
the terminals on the terminal board.
Is the
voltage between
terminal of black lead
wire on the relay in the out door
unit and terminal "N"on the
terminal board the power
supply voltage ?
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.
For AY-AP24DR/AE-A24DR, AH-AP24DR/AU-A24DR
NO
Is the voltage
between terminal "N" and
YES
"4"("2" ..... AU-A24DR) in the outdoor
unit the power
supply voltage ?
Measure resistances of TH1 and TH2.
Are the resistances
conformed Fig. 1 ?
YES
Replace the PWB ass'y with a new one.
Replace the relay in the outdoor unit
with a new one.
NO
NO
Replace the thermistor ass'y with a new one.
30