I bought a used pit boss. It was not powering on so I replaced the blown 5 amp inline fuse. Once I got it powered on I was getting a Err code so I replaced the temperature probe. That got rid of the error and I thought I was all set. Well I went to do a test run and followed all the correct steps for preheating and I noticed on smoke the auger kept feeding the pot and The lighter would not go off. I tried raising the Psetting to the highest and still doesn’t slow the augur down. It reached up to almost 600 degrees before I turned it off. After it was in the off settings, it still was turning the auger and lit. I had to unplug it all together. Any ideas what would cause this?