Room comfort is easier to manage when the air-conditioner remote responds correctly. Worn buttons, battery corrosion, or a damaged case may prevent commands from reaching the unit. Test the air conditioners built-in controls first to rule out a problem with the appliance. Match the replacement remote to the full model number because simil...Read morear units may use different signals. Fit new batteries of the specified type, point the remote toward the receiver, and remove the batteries if it will be stored for a long time.