As many have written, my GDO car remote suddenly quit working. The exterior garage keypad and interior wall buttons work fine. There is no light on the wall unit pad. I have changed the remote battery and tried to check the vacation lock, but without the wall unit light I have no way of knowing if there is a communication. I tried to lock/unlock several times, so that should have fixed any lockout problem. Could the exterior keypad code be interfering with or overriding the remote? I recently purchased the home and have no manuals. Sears/tech support won't help, they quit offering tech support unless purchase was within 90 days. Please help!

Model: 139-53964SRT

Remote dated 06/06, verified it has the correct three blue buttons. It worked well for about 4 weeks.

Exterior Keypad: May be generic, don't know if it came with GDO.