Bought a new house with 2 Englander pellet stoves. Model 25-PDVC. One of the 2 will not fire and keeps resetting on the control panel (video attached). If I manually start a fire and turn it on after it goes into shutdown mode I can sometimes get it to run and then it will go all day no problem. I have tried to call the service department of Englander but cannot get through. I have vac'ed everything I can see from the unit. Anyone have any ideas where I should start? Completely new to pellet stoves!