We have a bathroom fan installed in a wall to directly duct to the outside. It's an older Nautilus. When I turn the knob to turn it on, it hums, but the blades don't move. I can't even figure out how to get the fan cover off. Please help!
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Most exhaust fan covers use a spring steel wire in a V shaped configuration. The bottom of the V is attached to the cover. There is a slot in the fan housing and by pinching the tops of the V togetherand insert them in the slots the spring pressure pulls the cover up tight to the ceiling.Carefully pulling the cover down enough to reach over the cover and pinch thewires together should allow the cover to be removed. Hope this helps.
The roaring noise is probably the fan blades (looks like a hamster wheel) are worn out as it rotates on the spindle/shaft.
It may be a problem with the 4" exhaust ducting, that connects to the exit part of the fan, has come loose. Theres a damper (kinda like a flapper) at the fan/ducting joint may have broken off and may be sitting sideways in the ducting flapping around inside the duct.
At any rate I highly doubt its wiring. Sounds like its time to pull the fan cover off (turn the power off first via the wall switch or the service panel breaker would be even better) and look at the fan blades. Clean off any dust bunnies, lint, etc. and turn the fan back on. Did the noise stop?
If nothing looks out of place and it still makes noise you'll have to get in the attic and remove the ducting from the fan and see if theres a problem at the connection there. Maybe a squirrel put its bedding in the ducting? It happens.
Could be lots of reasons for the noise but wiring it wrong wouldn't cause roaring. The fan wouldn't work, or worst burn up, if wiring was the issue. The problem is the more than likely the fan blade assy is worn out or something is restricting the air flow in the ducting going to the outside of the house.
this is easy. take it off the wall and on the top in the back there is a panel take it off and switch the direction of the diverter. so it si facing either sraigft up or facing out to the back , so it lines up with your duct work.
Not sure what you are asking, but you can get a replacement directly from Sears. It is okay to replace just the motor, but be sure the fan blades are completely cleaned. When you are all done, verify good air flow outside of the building.
The exhaust motor was not installed properly - it has to be turned 90 degrees so that the blower openings face up instead of the front. Whoever installed it didn't read the directions:) Unfortunately, the unit will have to be taken down from the wall to correct the motor.