Sharp AH-A07BE Service Manual page 27

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 "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.
Fig. 1 Temperature properties of indoor thermistors
K
100
Thermistor
Connector
Room temperature
No. 3 to 4
80
Heat exchange
No. 1 to 2
To measure the resistance, first remove
60
the connector as shown at right.
Heat exchange thermistor
TH2 (orange)
40
25°C resistance 15 K
20
0
-10 0 10 20 30
NO
Replace the PWB ass'y with a new one.
NO
Replace the thermistor ass'y with a new one.
27
Room temperature
thermistor TH1
Color
Yellow
Orange
Room temperature
thermistor TH1 (yellow)
Tester
25°C resistance 10 K
40
Fig. 1
AH-A07BE-C/09BE-C
AH-A07BE/09BE/12BE
AY-A07BE-C/09BE-C
AY-A07BE/09BE/12BE
Heat exchange
thermistor TH2
4 1 CN4
Tester