Question about KitchenAid K45SS Classic Stand Mixer

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Speed switch doesn't work, Hi speed only

I have a Kitchenaid 575 watt, 6qt. mixer. After about 10 minutes of use, the ten speed switch no longer controlls the speed. It will only turn on and be at the highest speed. It will turn off and some times will not turn on at all. If it sits for about 45 minutes it will be fine. But after using it again the same problem will occur.My daughter loves to bake and I want to fix this problem as soon as possible. Thank you

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  • forrestm Dec 19, 2008

    I was making dough today and my mixer seems to have doubled its speed. The speed control does change the speed, but everything is light speed. I'm going to take it apart tonight and take a look at it.

  • gfisch Feb 19, 2009

    I went to make a batch of bread the other day, put the dry ingredients in my Kitchen Aid Professional Stand Mixer and turned it on at the lowest possible setting...only to see flour spewing out of the bowl as the speed of the mixer was off the charts. It sounded as if my mixer was about to launch into space. I turned it off and turned it back on as slowly as possible and once again warp speed - smelled the motor burning a bit. Decided to make the bread by hand. Later, I showed my husband...and the exact same thing happened again.

  • forrestm May 11, 2010

    I downloaded the service manual and found this "mixer runs at very high speeds" problem listed in the back. I did both of the suggested methods to narrow down the problem.
    1. The spring on the bottom wasn't detached as they suggested it might be
    2. They suggested it might be a problem with the phase control. I put a piece of paper between the T-bar and the motor "chattered". They said if it ran normally then it was probably a problem with the phase control, but my motor tested fine.

    So I'm stuck with opening the planetary gearbox to see if anything in there is broken. This problem is so strange because it runs smoothly, no weird noises, the motor still has plenty of torque, it just runs ridiculously fast.



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CAREFUL, do this unplugged. Behind the back plate (one screw on top to remove) there is an adjustment single security screw, lower center. Adjust this screw out or in as needed. Hit or miss but very easy. Repeat till all speeds work as designed.


Posted on Dec 20, 2008

  • Brian Higgins
    Brian Higgins Sep 30, 2014

    There is no adjustment screw in the 450 watt mixer, which I have, which has the same problem: it runs only on high speed, and sometimes does not turn on at all. There is brown, oily liquid head of mixer, probably transmission fluid. I guess there is a leak in the gasket. Also, my model# doesn't seem to exist anymore, KM25G


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Joedeven, I would recommend that you first check the Hall effect sensor which determines the speed.  I had this exact problem and I actually went out and bought another Hall sensor for about $13.  I replaced the original sensor and made sure that the connection between the sensor and control board was nice and snug. My blender worked as good as new! But I was curious to know if my original sensor was defective so I put it back in mixer and again made sure all of the connections were tight.  Guess what?  My original sensor also made my mixer work!  There was nothing wrong with my original Hall effect sensor except the connection between the control board and sensor was not adequate--unfortunately I didn't check the connections before I decided to buy another one. My guess is that the connection between the control board and the sensor probably loosens or comes undone over time from use and vibrations.
1.  Download the mixer parts and diagrams from the Kitchenaid website to see what the Hall effect sensor looks like. BTW the part number is 9703312. 2.  You'll need a phillips head screwdriver to open up the mixer. 3.  Make sure that the connection between the control board and sensor is absolutely tight and snug. 4.  Also, make sure that the orientation of the sensor connection between the control board and sensor is correct. it's hard to know which way the sensor should be connected because the control board has three prongs and the sensor can attach facing up or facing down. If, after you've made the connections, the mixer still doesn't work.  Disconnect the sensor and reconnect it with the prongs facing the opposite direction and try it.  I actually found the right orientation through trial and error.  By going through this trial and error, I also had my Eureka moment when I realized that the original sensor probably would also work it were reconnected with correct orientation.   5.  This whole process probably takes less than 10-15 minutes to perform.

Posted on Dec 30, 2008

  • joyofbaking Dec 30, 2008

    Oops I accidentally typed in "blender" when it obviously should have been "mixer."  I think this will fix your problem.  Happy mixing.


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