If you lose all three transmitters when you program one, they are not
being programmed correctly, probably because the directions are
confusing. (Some Chamberlain directions say to push & hold the smart
button & then push the transmitter button) If you do it this way you
will probably erase the codes. There is a LED light beside the smart
button. If you push & hold the smart button (approx 10-15 sec) until
the LED goes out you have erased all of the codes. To program the
transmitter push the smart button momentarily (LED lights solid), let
go of smart button, push the button on the transmitter within 30
seconds before the LED goes out, (LED will blink once). Transmitter is
coded & you haven't affected any of the other ones.

DoorDoc
www.ActionDoor.com

On Aug 20, 4:52 pm, "Karl Townsend"
wrote:
There's agaragedooron the side of the packing shed that is open/closed
every time a tractor load of fruit comes in. Three tractors most days.

If one remote dies, you have to retrain all three, otherwise the other two
won't work. this is getting to be a terrible pain. Plus, most of the time
the remote won't work till you're right in front of the shed.

So does anybody make a decent higher power remote? We're going to buy three
new ones.

Karl