I have a englander pdvc25 stove, just replaced the lower auger motor and now the stove struggles. Doesn't blow hot air like it use to. I did a deep cleaning, but still not blowing hot. I did a mode reset and got it to go back to D mode...but I did it a second time to check and see if it was still in D mode and ot had reset back to A...how do I know if the D mode is good and wont reset to A???its driving me nutz!