thank you for your prompt reply. my Chamberlain B970 has battery back up, won’t the battery maintain a constant power supply to the wall control panel? Where can I adjust the controller on the 883LM? thank you.
The opener has a battery, but the wall console doesn’t. It charges onboard capacitor from the same connection they communicate. If there is too much going on the line, the capacitor can’t recharge. Consider using a wireless dry contact adapter if the issue persists.
thank you. how long do the lithium batteries inside the 891 last?
The batteries should typically last at least three years under normal use.
how do i wire the speaker wires
Those are connected to the normally open relay contacts.