I have an overhead door garage opener model 556 and purchased a Chamberlin universal remote control that supposedly work with ALL opener. Has anyone had success using this remote with this opener? Thanks

There are different frequencies used, THAT universal MAY not work.
Here are a couple:
index (http://www.chamberlainremotesonline.com/?gclid=CNOgmIznjpcCFROgnAodNybSzw)
See if you can get receiver info.

See if this helps:
US Door Control - Chamberlain & Lift-Master Compatibility Chart (http://www.usdoorcontrol.com/liftcompchart.html)