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Hi -- I just spent a couple of days taking out the old assembly, cleaning all the parts (layers of dust coats) and putting the 9093N back in order to fix the noisy fan. The cold air coming back in is from to the heating and I'd guess the heating element is busted. Yes, you can run it in both airflow modes: ceiling air exhaust and hot air blown to the floor. That said, the noise level on mine hasn't gone down. So I'll look for the replacement assembly. Good luck!
This fan has a blower motor which will eventually fail. The fan will still oscillate , but the blower motor will burn out. The motor thermal fuse will fail , lower bearing failure and armature burn out. No replacement motor less than fan price so, when it goes buy a better longer lasting fan.
The heat sensor or thermal switch can go bad, so can the motor.
Try a few things;
shut off power going to fan. try cleaning out the thermostat housing using some compressed air on low pressure, or use a vacuum cleaner on blow, or a hair dryer on no heat. you can also spray the inside with contact/motor cleaner(home depot electric dept.) and then blow the thermostat out of any dust or particles that may have lodged inside.
To see if the thermostat works at all, turn power to fan on. Take a hair dryer on heat and place near thermostat - to see if fan comes on.
To rule out a bad motor, the thermostat can be bypassed by hooking up the feed wires to the fan itself, if you're handy with wiring.
Ventamatic web site does list replacement parts for fans... Good luck!
You can purchase heating elements for this fan that will solve the problem. This is a fairly new fan model so I would recommend calling Nutone because this model has a three year warranty. They may send you the part you need for free.