It looks like a DIY plywood cage and I don't see the charred remains of a thermostat probe. I hate to put the chicken before the egg, but I can probably guess what happened here...
Originally Posted by satomi325
Did you have a thermostat hooked to the flexwatt?
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Actually this can happen even with a t-stat if too much weight is put on the Flexwatt. I found this out the hard way early on.