my Harman xxv won't fire. I've owned stove since 2009 we left for 3 days and had a neighbor replenishing pellets . Came home to a cold home. If I run on test mode both combustion and Dist fans run and auger motor feeds pellets into burn pot. When I put on auto , room mode nothing. If I unplug and wait 30 sec combustion blower comes on for 4 sec and then nothing. If I start on manual combustion fan runs but that's all? I have never run up against this issue any ideas?