Nobu NBFS-48IDU Service Manual page 40

Is receiver on
NO
indoor unit exposed
to direct sunlight?
YES
Is there any thyristor
fluorescent light
Keep indoor unit away
Avoid direct
from thyristor
sunlight.
fluorescent light.
YES
NO
nearby?
YES
Does indoor unit
NO
start to operate by
automatic restart
function?
YES
Does radio sound is
affected by remote
control when a
signal is transmitted
at distance of 5 cm
from radio?
P.C. board is defective.
Replace P.C. board.
Press START/STOP button.
Is transmission mark
indicated?
YES
Does indoor unit
operate when
NO
moving remote
control near receiver
YES or indoor unit?
YES
Batteries are exhausted.
NO
YES
Replace
batteries.
The unit does not beep at all.
OPERATION indication on
indoor unit is not indicated.
NO
Press RST button on remote
control with tip of pencil.
Press START/STOP button.
NO
Is transmission mark
indicated?
YES
NO
Does indoor unit
beep and operate?
YES
Normal
operation
Remote control is
defective.
Replace remote
control.