I am having issues too. My new et732 seems to be inaccurate by 20-30 high. It starts off well, 15 higher than my side mount thermo on the drum, and them will randomly shoot up 20 - 30 degrees about a few hours in. When I get the drum down to 225 on the maverick, then the drum thermo says 150-160. Doesnt seem right.
I am going to do a boiling water test tonight. This thing is brand new. I dont trust it right now...
3 x UDS, Weber 22.5" Kettle, Maverick ET732. Member KCBS.