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888LM blinking red & yellow and beeping every 30 seconds

I just received my 3 888LM Wall Controllers, an 877MAX Keyless Entry and G828LM Internet Gateway kit. My Openers are (3) Craftsman 1/3 HP Belt drive units with dates of 06/98 and Model or Control Unit #41A5021-2C – these should be compatible according to the specifications (red learn button, gray antennae) but it seems that they are not – the wall units are blinking red/yellow and beeps every 30 seconds or so. I also tried all three wall units, all of which just blink red/yellow and tone every 30 seconds or so.


Please Help, otherwise I’m going to need to return all of these items but would REALLY like to get these installed.

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  • I have the 888LM with a Chamberlain opener and it worked fine for years.  Just started flashing red and yellow and doing triple beeps continuously.  Researching the internet gives mixed solutions.  Some say replace the 888LM, and other's say it's bad capacitors in the opener.  Some say the circuit board has been recalled and will be replaced for free.  Yet other's say they won't replace it for free.   One common thread I have found - Liftmaster/Chamberlain customer service sucks and they don't respond.  Good luck.
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  • This reply was removed on 2017-08-06.
    see the change log
  • The answer to my question is that the control units I have in my older Craftsman openers are not compatible, contrary to what I've read. I even went as far as to wire the wall controller directly to the opener, just to make sure there was no wiring problem, and it still just beeped. After a month of messing around with support, I returned all of the equipment for a refund.
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