I bought a kegerator, nothing but problems and foamy beer from the start.
We changed out the regulator, was leaking CO2, replaced the tavern head, still, nothing but foam. Contacted the company, they sent us an email from another customer, replace the tube from the tavern head to the spigot-10 feet of 3/16 inside diameter tube, that's right-10 feet of tube. I was dubious, didn't make any sense to me. They were absolutely right, it solved the problem. After 2 kegs of foamy beer that would settle into flat beer, we are now drinking carbonated, unfoamy beer. We drink Miller Lite, I don't know if it's the brand, my niece and her hubby drink Bud light and have never had a problem with their kegerator. So, before you start changing out parts, try the hose. We have about 10 pounds of pressure on the keg, but, since replacing the hose, doesn't seem to matter what the pressure is set at.