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I’m Frustrated

888 LM, slow flashing lights, 30 second beeps

I've just purchased the internet  gateway combo unit, but it's not working after I've installed it.
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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