I've had this MES 30 since August 2014 (my second MES). Just recently I was smoking salmon at 160 and after an hour I went to add some chips and noticed the temp at 275. Darn fish is now cooked well done. Next day I checked out the smoker and set it for 100 degrees and after one hour, the temp read 320...I immediately shut it down.
I called Masterbuilt and they said I need a new body kit which is about the same price as a new smoker. I did pull the back off and try replacing the thermostat with no change. It's like the burner is never shutting off.
Anyone else ever have this issue?