This is my 6th year using a Harman XXV. Having trouble keeping the house warm. Apparently I have been living in a cloud because I now realize the fan is not blowing much if any. I removed back cover to view distribution fan with heater on Room Temp Mode, distribution fan set between medium & high, feed adjuster on 4, manual setting. Outside temp is 27. Inside temp is 61. Distribution fan light is on but fan is not running. I turned off stove and let cool down. I can not spin the distribution fan. Is the fan supposed to spin freely with stove off? Thanks for any information.