Whenever I have my AC on in my apartment, the furnace (which also has the fan for all the ventilation) makes a loud clanking noise. I reported it to the office and the guy said he thought the blower motor was out of sync. I didn't have time to ask him how to fix it. Anyone know how you would re-sync it?
Try switching your wall thermostat fan switch to the on position. That is suppose to make your fan run 24/7. If it starts then your stat is not always making the connection in the auto position, and you need a new stat. If it still won't work, remove the cover of your furnace and trying spinning the motor by hand(w/ switch back in on). If it starts then you either have a dead spot in your motor windings, or a bad motor start capactior. If the motor is old your better off just replacing both. Unfortunately you can't go and get a motor just anywhere, but you can get a stat at a hardware store. If you need a motor check on the furnace manufacure's website for a parts dealer in your area.
You might get in trouble but shut off the power at the breaker,unwire the motor and label the wires,look for two nuts on the top of the squirrel cage,remove them and put them aside,at this point the squirrel cage will slide out on the tracks.Set it on the ground and spin the wheel around.see if it is hitting the side of the housing,see if the fins are bent(which if they are the wheel will have to be replaced),or if the wheel is loose on the shaft and tighten the set screw as needed. Aside from that the bearings are probably bad in the motor and it will have to be replaced.
