First time posting, any help would greatly be appreciated. I have had a king pellet stove, 5505, for two years now. This year a fuse blew and error code ER8 came on. I replaced the fuse and when I plugged it back in I noticed a loud humming noise. Long story short I checked the room fan by plugging in to an outlet and I works fine. I just completed a fairly thurough cleaning by vacuuming and blowing the unit out with air and still the same loud noise. Is there any testing that I can perform to see if it's the circuit board or am I missing something. Once again any advise would be helpful. Thanks