Have an electrical question, please help! Radiant Heating?

radiant heating

We have radiant heating installed in our ceiling and the other day my husband went to turn off the thermostat and it smoked a little bit. It was later in the day we realized that the heat is still on. It is nearly 80 degrees in here without the windows open and the ceiling is warm even though the termostat appears off. We are not electrical people and in no way can afford an electrician’s quote, let alone getting it fixed!!! Anyone know what might have happend?
Thanks!

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