The troubleshooting chapter in the manual is pretty sparse, so there's not much I can pursue.
The steps I've taken:
Verified that white goes to white, red goes to red.
Eliminated house wiring- I hooked the 888LM directly to my opener with a foot of wire.
When I connect the unit, I get the following sequence:
Fast Red/Yellow flash
<sometimes a fast red flash.
Slow Red/Yellow Flash
Beep every 30 seconds
The manual says that "slow red/yellow" flash indicates that the device isn't compatible with my garage door opener, but I've got a Chamberlain 1280R manufactured in 11/98, which is listed as a compatible unit.
I've heard that "not all units manufactured in 1998 are compatible, there's nothing you can do."
Is there any further troubleshooting to be done, or do I simply have to return my gateway and 888LM and buy a new garage door opener? I feel like I did my research prior to the purchase, and the only thing I had to go off of was:
"• For LiftMaster Security+ Garage Door Openers manufactured after 1998. Look
for a purple “Learn” button and antenna wire or orange/red “Learn” button with a gray antenna wire. "
or
The MyQ Control Panel is intended to be installed with Security+ Garage Door Openers Manufactured between 1998 and present."
There's not a lot of information to go on. I see several posts here in this forum with the same symptoms, but not a lot of detail as to what it took to get resolved.
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