Carrier 42NQV050M Service Manual page 69

(5) Troubleshooting for remote controller
<Primary check>
Check that A or B selected on the main unit is matched with A or B selected on the remote controller.
Is receiver
NO
on indoor unit
exposed to
direct sunlight?
YES
fluorescent light
Keep indoor unit
Avoid direct away from thyristor
fluorescent light.
sunlight.
Is there any
NO
thyristor
nearby?
YES
Does indoor unit
NO
start to operate by
automatic restart
function?
YES
Does radio sound
is affected by remote
controller when a signal is
transmitted at distance of
5 cm from radio?
P.C. board
is defective.
Replace
P.C. board.
NOTE : After replacing batteries,
Push the START/STOP button.
Is transmission
mark indicated?
YES
Does indoor unit
operate when moving
NO
remote controller
near receiver or
indoor unit?
YES
Batteries are
exhausted.
NO
NO
YES
Replace
batteries.
push the RESET button
with a tip of a pencil.
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The unit does not beep at all.
Operation lamp on indoor
unit is not indicated.
NO
Push RESET button
on remote controller
with tip of pencil.
Push the START/
STOP button
NO
Is transmission
mark indicated?
YES
Does indoor unit
beep and operate?
YES
Remote controller
is defective.
Normal Replace
remote controller.
operation