I've had this MES 40 for a couple months. Model # 20070211. Used to smoke just fine, but now it wont even burn the chips in the tray. Doesnt even darken them. Just dries them out. It's probably the heating element itself. I have probe thermometers, but I'm not sure that they're accurate outside of meat. I've got a surface thermometer coming in the mail, and Masterbuilt is sending me a retro kit, but I'm not sure that the retro kit will be the solution.