Single oven fan is making loud vibrating noise. I've tightened screws and everything works - but too loudly to want to use it.

Based on your description I believe you are hearing one of the elements vibrating as it heats up. As the voltage is supplied to the designated heating element vibration can occur if the element is slightly uneven in its cradle. If you are going to attempt to check the cradle for looseness please turn off the breaker to the unit before doing so. Check the feet on the lower unit and the hanging brackets on upper broiler if so equipped. There are some screws at the back that attach the elements check for tightness and alignment of the bracket. Sometimes people lift the element up to clean under it and it does not seat properly.
If you are in anyway not comfortable or don't find the cause, call a qualified tech.
Repeat....turn off breaker to the unit.

Hope this helps.
Best to you.

Hi,
It's not a fan oven, so there's no moving parts.
It must be a panel or component (such as a shelf) vibrating in the heat.
When it's cold have a good look at the inside & see if there are any screw heads you can tighten & any of the components which can be pushed tighter.

Also check the thermostat probes to make sure that they're not vibrating against the side or top of the oven.?
Best of luck

There are two things that come to mind, the magnetron is starting to fail, or the strapping has come loose on the fan motor housing, unplug microwave oven and remove top, [several screws] carefully inspect the fan for any loose mounts and tighten.

It sound like your fan is loose and needs to be tightened. Remove the four screws on the bottom of your unit, slide out and tighten the screws on top of unit. If you need to get in the unit remove the back screws, you will have to remove the temp sensor to remove the back panel. Remove the side panels on both sides. You should be able to get to the fan.

JUST REPLACED BOTH FAN MOTORS ON A DOUBLE BOSCH 755. DIDNT HELP MUCH.THE FAN IS LOUD COMPARED TO OTHER BRANDS.UNLESS YOU NOTICE A DRASTIC CHANGE IN NOISE, DONT WASTE YOUR MONEY ON A NEW FAN MOTOR.ITS JUST THE WAY IT WAS MADE.

The fan could have an obstuction. I have heard of tech sheets getting into the fan and causing a vibration and vibrating sound.

Hi

does the noise start as soon as you turn the fan oven on?
does the noise stop as you turn off?
just depending what make and model you have there is two fans
in it 1 is the fan motor inside oven at back and other
is the cooling fan which is at top of oven .you just need
to find out which one it is and just replace . then should be back to normal

regards dan

We have a double ge wall oven. The vent fans had become really loud. I checked the price for new fans...$275 each! Plus service of $200. If your oven is not too old, go to GE service purchase a 1 year service contract for $93.00. Wait one one month till it takes effect. Call them and request service and the entire replacement is free.

yes, if the humming is not the loud sound then the fan may need some lubrication or if it is tripping the circuit it will need replacing , but if it seems like it is a viberating noise from the fan , then it could be that its bearings are bad , but the whole fan motor would still need to be replaced , but if it sounds like it just may be a loose fan motor , then tightening up the screws on the motor would stop the vibrating sound and or the fan blades from scraping metal( another sound you may be hearing )

If you mean a loud buzz that cuts on and off as the oven works, it is probably the outer metal cover vibrating as the magnetron powers up and down. Try holding/ pushing/ poking the metal cover while the oven is working, if the noise abates or goes away, this is the problem.
You may get relief by simply tightening the screws securing the cover, if not, maybe a little careful insertion of a thin strip of cardboard or similar, at the point the vibration occurs, may dampen it. Good luck.