14
Check of indoor electronic control P.C. board
C
The unit does not operate with the remote controller.
Also, the OPERATION INDICATOR lamp doesn’t light up by pressing the EMERGENCY OPERATION switch.
Measure the voltage between receiver P.C.board connector CN101 No.2(+) and No.1 (-)
when remote controller button is pressed.
Yes
Yes
Check of remote controller and receiver P.C. board
B
Indoor unit operates by pressing the EMERGENCY OPERATION switch, but does not operate with the remote con-
troller.
Replace the batteries.(Refer to page 10.)
Turn on a radio to AM and press switch
on remote controller.
Is noise heard from radio?
Are there any fluorescent lights of
inverter or rapid-start type within
the range of 1m?
Is the voltage approx. 4V DC ?
Replace the indoor electronic control
P.C. board.
Replace the receiver P.C. board.
Replace the remote controller.
●
Reinstall the unit away from lights.
●
Attach a filter on receiving section of
the indoor unit.
Is LCD display on remote
controller visible?
Remove the batteries, then set them back and
press the RESET button. (Refer to 10.) Check
if the unit operates with the remote controller.
Yes
Does the unit operate with remote
controller?
Yes
OK
No
(not clear)
Yes
No
No
No(5V or 0V DC)
No
Switch on the remote controller.
w
Check if the remote controller is exclusive for this air conditioner.
Check both “parts side” and “pattern side” of indoor
electronic control P.C. board visually.
Replace the fuse.
Is fuse (F11) blown?
No
Yes
No
Is varistor (NR11) burnt?
Replace the varistor.
Yes
Replace the indoor
electronic control
P.C. board.
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