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Tried to replace my thermostat, made things worse...
I had an issue where my thermostat was no longer working so I went to replace it. I must've messed up the wiring because when I turned on the new thermostat, I noticed smoke coming out of whatever it is in the pictures I included below. This thermostat controls my basement heat which is water/baseboard gas heat. I disconnected the new thermostat and I think it would be best if I call a professional for this. Does anyone know what the below picture is? Would it be better to call an electrician or heating specialist?