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There are two possible causes, either remote is bad or remote sensor on box is defective.
You can verify the remote by using a digital/ cellphone camera to check the infrared signals output of remote. While looking the remote front tip where IR bulb is located, through digital/ cellphone camera, press buttons on remote. If a flashing light is visible then remote is working and problem is would be remote sensor mounted on box that will be replaced.
If no flashing light found on remote control front tip then the remote is bad and you would need to buy another remote which is available at following link..
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