Question about KitchenAid KSM90 Ultra Power Series Stand Mixer

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My Kitchenaid K5SS 300 watt standing mixer launches into the highest speed regardless of the speed selection. It functions with a sliding knob and I can barely ease it from off to stir and it goes from no power to flinging flour all over the place. suggestions? When move speed control it is on high. Just started doing this. It is about 5 years old but not used much. Dale

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  • happyjappy Dec 02, 2007

    My Kitchenaid Artisan Stand Mixer KSM150PS goes from off to about speed
    4 and doesn't go any higher no matter where I slide the knob. I've had
    this problem for about a year now, but never took it in to get it
    fixed. I've had this mixer almost 10 years now. Is it time for a new
    one? Or, how can I fix this problem myself?

  • DocBoggs Sep 29, 2008

    I have had the same problem with the speed switch. It works till speed 6, but it will not go any faster. It malfunctions differently every time. I used it about 12 times since I bought it a year ago. So I brought it back to the store and got the Artisan KSM150. Right out of the box same problem.Seems like the factory is using bad switches?? Also both pieces of equipment I purchased have some pretty questionable sounds coming from the gear box.Is this normal as well? I'm getting frustrated with this KitchenAid equipment.

  • jentheknee Nov 05, 2008

    My husband dropped our mixer and it won't turn off. Is the solution the same - get a new speed switch?

  • Janeatc Nov 25, 2008

    Did you ever find a solution? I have the exact same problem!

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I would recommend that you first check the Hall effect sensor which determines the speed.  I had this exact problem (but mine occurred with a 600 professional model) 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. 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

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I had a similar problem where the mixer would also go to fast speed right away. On the back at the top was a screw that was loose. After tightening this screw I had 4 speeds but no stir speed. I unscrewed that screw and a bolt fell out. This bolt went to threads on the inside of the area covered by that back plate. I put that bolt back on and tightened it and the corresponding one on the other side and wala the mixer works perfectly at all speeds. Hope it helps. Make sure mixer is unplugged before attempting anything like this (wires are exposed when the back plate is removed - some kind of flexible circuit board).

Posted on Dec 29, 2008

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I had the same issue and bought a new hall sensor / speed sensor. However, after replacing it, the problem wasn't resolved. I then noticed that the magnet on the motor shaft had moved out of position, and was not directly under the sensor. Once I moved this back in place, it worked with the old sensor... so now I have an extra sensor. I now need to glue/fix the magnet in place, as I would assume it will move out of place over time.

Posted on Feb 07, 2015

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Ok to answer both of your questions. the mixer needs a new speed selector switch. it sounds to me like the contacts are burnt out or worn out one. the motor is fine its just the motor isnt getting the right voltage from the switch. its either on or off or medium speed or no speed. either way you both have to replace the switches. you can get the parts and do it yourself at kitchenaid.com or your local appliance store should be able to get them for you to.

Posted on May 05, 2008

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