AU-A24 (serv.man8). Troubleshooting — Sharp Air Conditioner Service Manual (repair manual)

Model
AU-A24 (serv.man8)
Pages
4 Few pages! See other manuals at the bottom of the first or last page.
Size
417.99 KB
Type
PDF
Document
Service Manual
Brand
Device
Air Conditioner / Troubleshooting
File
au-a24-sm8.pdf
Date

View Sharp AU-A24 (serv.man8) Service Manual online

AH-AP18CS
AH-AP24CS
AU-A18CS
AU-A24CS
16
TROUBLESHOOTING GUIDE OF CONTROL CIRCUIT
measure the secondary voltage
of transformer.
YES
NO
YES
NO
The machine does not function
at all with remote controller and
switches on the indoor unit. 
Using a tester, measure the 
voltage between anodes of D1 
and D2 on PWB ass'y.
Is the measured value 
approx. 17.0 Vac ?
Replace the PWB with a new 
one.
Is the WPE1 fuse down ?
Replace the fuse and varistor 
with new ones.
Replace the transformer with
a new one.
17
AH-AP18CS
AH-AP24CS
AU-A18CS
AU-A24CS
YES
NO
NO
YES
The machine does not function
with remote controller 
Push button "OI" on the wireless 
remote controller.
Is transmitting
indicator of the remote 
controller active ?
Is indicator lamp of
indoor unit proper ?
Replace the 
PWB  with a 
new one.
Does beep sound
from the indoor unit ?
Using a tester,
measure the voltage
between terminals
of resistor R26
on the PWB ass'y.
Push the button "OI".
Are batteries of the
wireless remote controller 
proper ?
Replace the batteries 
with new ones.
Replace the wireless
remote controller.
When the signal is
received, does the voltage
change ?
Replace the PWB with a new 
one.
PWB is normal.
Inspect the outdoor unit.
NO
YES
NO
YES
Replace the photo 
detector unit with a new 
one.
NO
YES
AH-AP18CS
AH-AP24CS
AU-A18CS
AU-A24CS
18
The room is not cooled at all
or not cooled.
The compressor does not operate.
Measure resistances of TH1 and TH2.
Push the button "AUX." on 
the  indoor unit, for more than 5 sec.
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.
Fig. 1
Using a tester, measure voltage at
the terminals on the terminal board.
100
80
60
40
20
0
-10
0
10
20
30
40
Resistance
Thermistor
Room temperature
Heat exchange
Color
Yellow
Orange
To measure the resistance, first remove 
the connector as shown at right.
Room temperature 
thermistor TH1
Tester
Connector
No. 3 to 4
No. 1 to 2
Fig. 1 Temperature properties of  indoor thermistors
K
Heat exchange thermistor 
TH2 (orange)
25
°C resistance 15 K 
Room temperature 
thermistor TH1 (yellow)
25
°C resistance 10 K
Heat exchange 
thermistor TH2
Tester
4
1
CN4
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.
19
AH-AP18CS
AH-AP24CS
AU-A18CS
AU-A24CS
For AH-AP24CS / AU-A24CS
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 " AUX." on  
the indoor unit, for more than 5 sec.
Is the voltage
between terminal of black 
lead wire on the relay in the outdoor unit 
and terminal "N"  on the terminal board the 
power suuply 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.
Using a tester, measure voltage at
the terminals on the terminal board.
Replace the relay in the outdoor unit with 
a new one.
Is the voltage
between terminal " N " and
" 2 " in the outdoor unit 
the power supply 
voltage ?
YES
NO
Page of 4

Download Sharp AU-A24 (serv.man8) Service Manual (Repair Manual)

Here you can view online or download Sharp AU-A24 (serv.man8) Service Manual in pdf. This Service Manual can help you recover, restore, fix, disassemble and repair Sharp AU-A24 (serv.man8) Air Conditioner. Information contained in Sharp AU-A24 (serv.man8) service manual (repair manual) typically includes:

  • Disassembly, troubleshooting, programming, maintenance, remote, adjustment, installation and setup instructions.
  • Schematics, wiring and block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Parts list (bill of materials).