I know it's not the hose because it does the same thing when the hose is not connected. Plus it also does this when we try to use the toe kick in the kitchen. It's not the electrical 110v outlet because I also have a 18v battery charger connect to that outlet and the charging light stays on during this time. The bag is completely empty and new. The secondary filters are clean and in place. Someone mentioned something about the bag blocking the flow, How is that possible? It can only go on one way. Any way of testing that thermal switch? Where is it located? Where the hose connects?