I recently purchased a timber ridge 55-trpah from amfmenergy. Stove has been working great but lately it seems as though the room air blower seems slow to turn on. Settings are still 1-4-1 as came from factory. Stove will run through start up as usual but sometimes it goes into "run" for several minutes before the blower turns on and starts circulating air. Blower was turning on while still running thru start-up mode and flame was burning good. Once the blower turns on it runs continuously as it should. Could it be a sensor problem? Everything else seems to be operating as it did when I first started the stove up. Thanks