I have had my HR24-500 since late May. The remote control that came with it only works at very close range (< 2'). Getting it to work at a farther distance is hit-or-miss. This problem has existed since the day the installer brought the box. I have tried replacing batteries. I have tried switching setup from IR to RF and back. I have tried resetting the receiver. I have tried the remote from other D* receivers, but I am not sure whether or not they are compatible. How can I determine if I have a bad remote or a bad IR receiver in my HR24-500?