The dist. blower on my Harman Advance comes on for a short time once the stove is up to temp. then shuts off B4 the room gets up to temp when it is set on room temp. Blower will come back on a short time later, but again will stop blowing out before getting to the desired room temp. Seems to work fine if I am running the stove on the "stove temp" setting. Could it be a bad thermostat? Just gave the stove its preseason cleaning. Thanks!