Depends on where it was. It looks like a Thermal Switch to me....
If it was attached to the side of your heater where the hot air is, it's job is to shut down the unit if it gets too high....as in when the fan blower is not blowing.
I would replace it....it's a safety item.....though, $300 sounds a bit high for a $30 item.
If it was attached to the side of your heater where the hot air is, it's job is to shut down the unit if it gets too high....as in when the fan blower is not blowing.
I would replace it....it's a safety item.....though, $300 sounds a bit high for a $30 item.