My mixer was working fine until yesterday. When I turn on the lowest turn speed it'll start off slow for about two seconds then start to climb up to the highest speed without me touching the handle!

Hi,have you set you speed of your rotations,maybe it's set to slow.you have to Adjust the screws in the backof the mixer,so the rotation of the motor is a second apart on the speed setting three.i quite sure that's the right speed number,I have it written down somewhere,if I can find it and it's different il let you know.ty hopethatworks.

You are not adjusting the screws correctly. All three screws (2 top left and right, and 1 bottom)
must all be adjusted. Here is how:

1. Loosen the lock nuts enough & Turn the 2 top screws clockwise until they cannot be turned
anymore. Leave the bottom screw alone for now.
2. Use a dab of white paint or paper whiteout to mark the positions of the Phillips screws.
3. Plug in your mixer and Set the speed selector to "Stir".
4. Turn each top screw One full turn couterclockwise (alternating between Left and Right)
Keep making one full turn at the time (for both left and right) until the motor starts running.
5. Put your hand near the Agitator shaft and allow it to brush your finger slightly. Use your
watch or clock and start counting the number of times the shaft touches your finger in
60 seconds. The correct count should be 60 RPM (Rounds Per Minute). If it is less
or more than 60, give each screw 1/4 turn counterclockwise or clockwise and start counting
again. Now tighten both lock nuts.
6. Set the speed selector to "6" and turn the bottom screw either clockwise or counterclockwise
to achieve a speed of 180 RPM.

For your reference, the planetary RPM's for the 5-qt. tilt-head Artisan Stand Mixer are as follows:

Stir speed - 60
Speed 2 - 95
Speed 4 - 135
Speed 6 - 180
Speed 8 - 225
Speed 10 - 280

You may have to adjust the mixer speeds. Obtain a copy of the KSM150 Repair Part List from Kitchenaid.com. Remove the screw holding the End Cover and locate the three screws from the Control Plate. All three (2 top left and right, and 1 bottom) must all be adjusted. 1. Loosen the lock nuts enough & Turn the 2 top screws clockwise until they cannot be turned
anymore. Leave the bottom screw alone for now.
2. Use a dab of white paint or paper whiteout to mark the positions of the Phillips screws.
3. Plug in your mixer and Set the speed selector to "Stir".
4. Turn each top screw One full turn couterclockwise (alternating between Left and Right)
Keep making one full turn at the time (for both left and right) until the motor starts running.
5. Put your hand near the Agitator shaft and allow it to brush your finger slightly. Use your
watch or clock and start counting the number of times the shaft touches your finger in
60 seconds. The correct count should be 60 RPM (Rounds Per Minute). If it is less
or more than 60, give each screw 1/4 turn counterclockwise or clockwise and start counting
again. Now tighten both lock nuts.
6. Set the speed selector to "6" and turn the bottom screw either clockwise or counterclockwise
to achieve a speed of 180 RPM.

For your reference, the planetary RPM's for the 5-qt. tilt-head Artisan Stand Mixer are as follows:
Stir speed - 60
Speed 2 - 95
Speed 4 - 135
Speed 6 - 180
Speed 8 - 225
Speed 10 - 2

Firstly, I think you mean "flour".
Put in your ingredients. Cover the mixer, head and bowl, with a dishtowel. Turn on mixer to "stir" (or lowest speed). But! Mix only for 1 or 2 seconds. Repeat this, with bowl covered, until flour is mixed in enough not to fly out.
Happy baking!

Your motor needs to be replaced. The speed setting should be able to be set from the start, and if it will not slow down or change speeds, the motor has been over-heated and will need to be replaced. The only quick fix for this is to bypass the speed setting, and change the brushes on the motor. If you do not know how to do this, ask a serviceman to change the brushes only. Brushes usually run about $30 to repair. Although, you will only have one speed.

the carbon brush was burned

Hi possum. Go to the Kitchenaid website and look for your model #. There you can download info on your mixer. You may not find info for attachments though. If in doubt as to what speed to select for any particular attachment, always start at the lowest speed setting, then increase the speed until you can hear the mixer begin to struggle. Then select the next lower speed. If this solution helps you then please rate it. Good luck! ricardok45

Hi. Get in touch with Kitchenaid Parts and order a new Control Board. If your mixer is still covered by warranty it's free. ricardok45

The repair manual says that the mixer can make this grinding sound at slow speed, like stir or 2. This is normal, especially until it warms up. This is the sound of the gears turning at slow speed.

The speed control is a governor setup, it's purely on and off, as the weights on the motor shaft spin faster, they press against the contacts, and when they spin a fast enough speed, it turns off current to the motor, which makes it slow down, and current gets turned back on.  That way, you get a pretty consistent speed on a setting no matter whether it's lightly loaded or whipping something fairly heavy.  If you can turn the motor shaft by hand, then you don't have anything binding, but you might have gotten the speed control out of adjustment.  give it another go.