Originally Posted by jasonjax
Ahh yes. I have experienced much the same.
In my Bubba Keg if I ran a couple of my wire probed thermos with the wire between the lid and the grill it would quickly go to HHH or whatever it was that was too hot to read even though it was no where near the "real" thermal max. I deduced rightly or wrongly that the metal wire was conducting the heat to the probe via being in direct contact with the metal.
The wire running to the probe should not be inside the grill. You can easily break the probe this way ( I have). If you want to probe inside the grill you need to get a thermometer with a longer stem.
Also, calibrate the thermo with boiling gwater (should be 212).