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Why is my vent fan running at only one speed?
To avoid personal injury or death, disconnect your appliance from its power source before you start any troubleshooting or repair work. Use caution when working inside any appliance.
The first thing to check are the filters on your range vent hood. If these are full of grease, they could stop the flow of air and the fan may sound like it is only running at one speed. Once your filters are clean, you can check the fan switch and the fan motor to see if they are the problem. You can get to these from under the hood, without removing it.