Carrier 40GRQ Owner's Manual page 7

Matching Remote Control
The RF remote control must be synchronized with air conditioner prior to use.
Follow the instructions below.
Note
Synch remote controls within 6.5ft (2m) from air conditioning unit.
While synching, the remote controller and air conditioner should be on standby
status.
Synching remote controller with air conditioner is a one-time requirement.
Programming remote control
. Press standy status on air conditioner.
. Stand near air conditioner while holding remote control. Press standby button on remote.
. Synching will occur automatically.
. If synch does not occur, move closer to unit and repeat steps.
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