Mitsubishi Electric MSZ-GS06NA - U1 Service Manual page 44

B Check of remote controller and receiver P.C. board
Check if the remote controller is exclusive for this air conditioner.
MSZ-GS06/09/12/15/18NA
MSY-GS09/12/15/18NA
Press OFF/ON (stop/operate) button
on the remote controller.
Is LCD display on the remote controller
visible?
Yes
Remove the batteries, then set them back
and press RESET button. (Refer to 9-1.4.)
Check if the unit operates with the remote
controller.
Does the unit operate with the remote
controller?
Yes
OK
MSZ-GS24NA
MSY-GS24NA
Press OFF/ON (stop/operate) button
on the remote controller.
Is LCD display on the remote controller
visible?
Yes
Remove the batteries, then set them back
and press RESET button. (Refer to 9-1.4.)
Check if the unit operates with the remote
controller.
Does the unit operate with the remote
controller?
Yes
OK
OBH874A
Replace the batteries. (Refer to 9-1.4.)
No
(Not clear)
Turn ON a radio to AM and press OFF/ON
(stop/operate) button on the remote con-
No
troller. *1
Is noise heard from radio?
Yes
Are there any fluorescent lights of
inverter or rapid-start type within the
range of 3.28 ft.(1m)? *2
No
Replace the indoor electronic control
P.C. board. (Including the receiver)
Replace the batteries. (Refer to 9-1.4.)
No
(Not clear)
Turn ON a radio to AM and press OFF/ON
(stop/operate) button on the remote con-
No
troller. *1
Is noise heard from radio?
Yes
Are there any fluorescent lights of
inverter or rapid-start type within the
range of 3.28 ft.(1m)? *2
No
Measure the voltage between power monitor
receiver SW P.C. board connector CN20A
No.2(+) and No.3(-) when the remote controller
button is pressed. (Refer to 9-7.5.)
Is the voltage approximately 4 V DC?
No
Replace power monitor receiver SW 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 OFF/ON
(stop/operate) button on the remote controller is pressed.
However, it may be difficult to see the illuminated LED of
the signal transmitting section with a smartphone
camera.
*2 If the inverter fluorescent light is turned on when the
room is cool, the unit may have difficulty receiving the
signal from the remote controller or may not be able to
operate with it; if the inverter fluorescent light is turned
on when the room is warm, the unit may be able to
operate with the remote controller.
No
Yes
*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 OFF/ON
(stop/operate) button on the remote controller is pressed.
However, it may be difficult to see the illuminated LED of
the signal transmitting section with a smartphone
camera.
*2 If the inverter fluorescent light is turned on when the
room is cool, the unit may have difficulty receiving the
signal from the remote controller or may not be able to
operate with it; if the inverter fluorescent light is turned
on when the room is warm, the unit may be able to
operate with the remote controller.
No
Yes
Yes
44
Replace the remote controller.
• Reinstall the unit away from lights.
• Attach a filter on receiving part.
Replace the remote controller.
• Reinstall the unit away from lights.
• Attach a filter on receiving part.
Replace indoor electronic control P.C.
board.