This is looking like the same runaround I am getting. Bought my third MB unit, this one a MES40G bluetooth electric upright smoker. 3 hours into my 6-hr turkey smoke, I went to baste the bird and am presented with this ERR 2 display which, regardless of my actions, would not clear, preventing me from knowing if the thing was still on, holding temp, time nothing. Unplugging didn't help as immediately upon reconnecting to the AC showed this error and nothing would clear it from the display. The only thing I could find on error codes for MB smokers says something about the temp probe. The only troubleshooting suggested was to inspect the leads to determine if they were burnt or otherwise damaged. The inside of that particular compartment was pristine. The actual probe appears to be damaged, but unplugging that from the controller failed to resolve anything.
Of course, you can't get a human being to answer the customer service line. ll you get is instruction to fill out some online support request. Today I was delivered a useless message stating they were closing my request because it appears my unit is out of warranty and here's a parts page to find replacement parts. But as to speaking with someone to find the path out of this error code overriding any use, basically a "Go F... yourself. We don't really give a damn."
I was seriously considering moving to one of their Gravity Units. Now, not so much.