AY-AP24 (serv.man8). Troubleshooting - Sharp Air Conditioner Service Manual (repair manual). Page 2

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19
AY-AP18CS
AY-AP24CS
AE-A18CS
AE-A24CS
YES
NO
NO
YES
The machine does not function
with remote controller 
Push button "O/I" 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 "O/I".
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
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