I have a RDB-103 operator. When the down limit is depressed the operator shut off.?

Question

I have an overhead door operator; RDB-103. When the down limit is depressed the push button station and transmitters don't work and the rooling curtin doesn't open. Can you help?

Answer 1

If you are talking about the actual limit switch, and it had been working, it probably has failed, or slipped on the sprocket. Take the cover off, place a jumper across the two wires and see it the curtain opens.