I have a Pelpro pellet stove. Went to bed and it was burning fine. Woke up and there was no flame and the stove was still on and blowers were still running. Auger was not spinning. Unhooked auger and tested it with another wire and it turned just fine. Hooked it back up to stove and not spinning. Checked vacuum line and it appears fine and not blocked. Bypassed vacuum sensor and auger still won't turn. Any ideas on what needs replaced?