If after swapping probes to opposite channels, you still got a hot channel 2, then you might have faulty flexwatt. Try and temp gun the spot where the probe is and see if it is truly 136ish. If it is, then like i said, you probably got faulty flexwatt.
And you can also try and hit the master reset on the Herpstat unit and go through all the settings again to triple check. If after all that, the stuff is still heating up, then I'd call Dion at Spyder Robotics. But personally I think you got a bad probe.....
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