27
Check of remote controller, display receiver P.C. board and indoor control P.C. board
B
Check if the remote controller is exclusive for this air conditioner.
Does the unit operate with the
remote controller?
OK
Yes
No
(Not clear)
Replace the batteries. (Refer to 10-1.4.)
Press OPERATE/STOP (ON/OFF)
(
MFZ-KJ25/35/50VE
)/ STOP/
OPERATE (OFF/ON)(
MFZ-
KJ25/35/50VE2
) button on the
remote controller.
Is LCD display on the remote
controller visible?
Remove the batteries, then set them
back and press RESET button.
(Refer to 10-1.4.)
Check if the unit operates with the
remote controller.
Yes
No
Turn ON a radio to AM and press
OPERATE/STOP (ON/OFF)(
MFZ-
KJ25/35/50VE
)/ STOP/OPERATE
(OFF/ON)(
MFZ-KJ25/35/50VE2
)
button on the remote controller. 1
Is noise heard from radio?
Yes
No
Replace the remote controller.
Are there any f uorescent lights
of inverter or rapid-start type
within the range of 1 m? 2
Yes
No
• Reinstall the unit away from lights.
• Attach a f lter on receiving part.
Replace the display receiver P.C. board.
Assign a number of remote controller.
(Refer to 8-2.)
Check if the unit operates with the
remote controller.
Does the unit operate with
the remote controller ?
Yes
No
OK
Measure the voltage between display receiver P.C. board connector CN301 (+) and (-)
when the remote controller button is pressed.
Is the voltage approximately 4 VDC - 5 VDC?
No
Yes Replace the indoor electronic
control P.C. board.
1 Look at the image of the signal transmitting section of
the remote controller through the monitor of a digital
camera or a camera phone. It is normal if the LED of
the signal transmitting section lights up when the OP-
ERATE/STOP (ON/OFF)(
MFZ-KJ25/35/50VE
)/ STOP/
OPERATE (OFF/ON)(
MFZ-KJ25/35/50VE2
) button on
the remote controller is pressed. However, it may be dif-
f cult to see the illuminated LED of the signal transmit-
ting section with a smartphone camera.
2 If the inverter f uorescent light is turned on when the
room is cool, the unit may have diff culty receiving the
signal from the remote controller or may not be able to
operate with it; if the inverter f uorescent light is turned
on when the room is warm, the unit may be able to
operate with the remote controller.
OBH666C
