I have a comfortbilt hp22 installed in the basement with the vent tied into a liner about 22, feet high. The stove shuts off with the fault saying check to see if there are pellets or check the burn pot. This happens randomly. Sometimes only after an hour of burning or six hours. I cleaned the whole stove and venting prior to use and clean the burn pot and empty the ash pan every day. There doesn’t seem to be an excess of ash anywhere and it won’t consistently heat because it shuts off. Any opinions on why this is happening or has anyone ran into this problem? Using tractor supply hardwood pellets at the moment