LiftMaster Garage Door Opener Problems



Question:
2 conductor bell wire to the wall control. I know it's not the wiring, since the wall control has a green LED behind the main button that lights up *if* it's getting voltage and *if* the wires are in the correct polarity. So not much to go wrong there.... Since I just purchased the receiver board, I may send it back for another, under the assumption that it is defective. Then again, perhaps there was a subtle change between the "A" rev. and the "D" rev. that is causing the problem.

Answer:
The logic board (what you call the receiver board) controls the whole opener & it should have come w/ a wall panel for that revision of the board. We always change the wall panel since sometimes the older ones are not compatible w/ a newer board revision. The easy test is to disconnect the wall panel wiring from the opener & wall panel. Connect the wall panel to the opener w/ a short piece of wire. If you still have the problem exchange the new board & the new wall panel. If the wall panel works fine, then the problem is in the existing wiring (most likely the wire being stapled too tight somewhere or something in the attic on top of the button wire)





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