I just got home and went into my reptile room to have 62 degree temps and a burning smell. The burning smell was coming from my ranco etc thermostat that was controlling my oil-filled space heater. The thermostat itself still shows the temps of the room but will no longer control the heater. I took the thermostat off the wall and it left black burn marks, i then unplugged the thermostat and now have my heater on low and have to manually turn it on and off. Can anyone let me know what happened and why? P.s the thermostat is less than a year old.