I have a Heil furnace (about 1992). The blower stopped working in any mode (heat, cool, or fan on). When I went down to look at it the replaceable filter had come apart and been sucked into the blower motor. I assume something in the system overheated and that is why it has stopped working. I took out the filter and the blower still rotates very smoothly when I push it by hand. Is there a fuse or something that protects the system and needs to be replaced, or would the motor overheat and need replacement.