With regards to KitchenAid Model KEMS307GBLO (micro/convection oven), access the back of the control panel and cut wires P5-4 and P5-5. The wires are labeled. According to the schematic, these are the pinouts for the "Meat Probe," and, "Meat Probe Chassis Ground." This will permanently render the probe inoperable, and all the aggravation that is causes.
Please proceed at you own risk. This was a fix for us using a schematic we found inside of the unit. NOTE: This fix is for a different model. Check your schematic (found behind the the control panel) to confirm which wire controls your probe.
On model 307, to gain access to the back of the control panel, simply remove the two vertical trim pieces that run the length of the appliance. They are secured by one screw each towards the bottom of the trim piece. Access to that screw requires opening the oven door. Once the screws are out, pull downward and outward on the trim pieces and they will separate from the body. Then, see the screws that hold the control panel in place. There's one on each side of the panel, facing outward. Once you remove those screws, the panel will fall forward gently. The P5 wires above are found at about the mid-point of the control panel.
Tired of Probe Problems, November 2014