Receiving unit green light is not lit. Tried realignment, no result. Door operates freely if detached from trolley. There are no obstructions to the light beam. Green light flashes at on the back of the opener motor. Pressing red reset button stops the flash, until the you attempt to close the door. Realignment attempt after pressing reset, no result. Door can be closed by holding in the wall button, but will not close with remote or keypad.
Is it possible the receiving unit is bad ? Can the receiving unit be purchased seperately or only in sets of sending/receiving ? Is there anything I'm missing ?
Door stopped working with no apparent outside influence. ie sensors knocked out of alignment or obstruction to cause it to reverse.