Why do a fan's speed settings go Off-High-Medium-Low? - Quora.
A rocker switch is one of the most common forms of switches in the world due to how easy it is to use and its reliability. It is an on-off switch that rocks back and forth like a see-saw. Rocker switches are commonly referred to as single pole and double pole which relates to the number of circuits that are controlled by the switch.
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Loosen the retaining nut holding the fan's speed-control switch to the switch housing. Use a pair of pliers, if necessary. Thread the nut off the switch the rest of the way by hand.
I turn the fan switch from low to high and nothing is happening, nothing blowing out the vents, I have no heat ac or defrost. Usually you can hear the fan motor going when on but there is no noise, nothing. I have checked all fuses and they are okay. Just wondering if it could be the resister or the blower motor.
Leviton Fan Speed Controls change the level of power in the fan motor to control the speed of your fan.
By putting High as the first setting, the fan is guaranteed to be spinning and have momentum before it gets switched to Low. You can try it out with a power strip to turn the fan on and off while the switch on the fan is set to Low. Some fans will start up fine, but some will just wiggle a bit without spinning.
Our fan speed selector switch is available in 24V and 240V versions and is mounted onto a single gang white plastic plate. It is most commonly used to interface with any type of fan such as an extractor fan or a fan delivering ventilation to a room. It allows the user to select off, low, medium and high speed.