Okay, so when the probe is inserted, there are two contact points in that jack that read the resistance of the probe and send the resistance reading to the control. I believe the wires on that jack have become shorted together and are sending that reading of 0 resistance, or full continuity, to the control. This is a very common problem and easily corrected by replacing the probe jack, pictured and available below.
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The link below is to the part you will need from a highly recommended company rated A+ with the Better Business Bureau. They offer a 100% money back guarantee, EVEN ON INSTALLED ELECTRICAL PARTS, for an entire year! They are the only company to allow returns on installed parts for a refund and offer a FULL ONE YEAR WARRANTY!
Probe Jack <----- CLICK HERE FOR THE CORRECT PART FOR YOUR MODEL
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