Hi. Started using my new Lopi Large Flush wood insert over the last couple of months. Love the unit I have one question related to the blower. My blower now is either on or off. I could swear the first month or so it had variable speed options with the dial. I noticed this because the blower is a bit loud. Is there a reason that it would only be one speed now? On high. Is it a blown resistor? and if so...how can I get fixed?