We have a Laramie 1200 cfm hood installed and it has a whistling noise when it is on high. Our installer has no clue and has given up. His only thoughts is well do not use it on high. The duct run is about 16 feet straight up after it comes through the wall. Duct is 8 inch diamter and there are not any restrictions.
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The motor is getting worn to the point it will stop soon. Remove the screen and you find the fan/motor directly behind it. You can try to put some machine oil on the motor shaft next to the motor housing. It may quieten it some. Recommend you replace it. Be sure you disconnect power before you do anything else. The motors and fan assembly is small in size and can be bought in Home Depot or an appliance store. If you need assistance in removing the motor/fan and installing new one, please let me know. Those brands are found at Home Depot.
Either a backdraft damper was never installed in the ductwork or the damper is stuck open...
Has it always been this way?? If so then the damper probably was never installed and you will need to have one installed to stop the air...
If it was good at the beginning and now is not then the damper is stuck open...you will need to find it and then get it working agian...
The dampers often are right at the outlet of the hood...if you take down the hood it should be right there...
I found the solution to getting out of the Sabbath mode in the technical information manual on www.servicematters.com . Push and hold the clock button for 5 seconds until it beeps and starts flashing. Unplugging the appliance does NOT reset it.
Gee, it would be nice if the Maytag site had manuals instead of just installation instructions for those of us who acquire appliances with our new house, but no manuals. Oh well, 1 hour of searching and now it works again. Geoff69 gave me the clue in his comment so I could recognize the solution when I saw it. Thanks Geoff69.
there won't be any noticable suction like with a vacuum unless the cfm rating is very high. the distance of the hood from the cooking surface is a factor too as you are sucking in room air besides the stove fumes and steam.