Why Read This Article?
Replacing the Board:
Tools & Materials
Be sure to unplug your mixer before you begin this repair.
A bad phase board in a stand mixer can cause it to spin on full speed, even when you've set it to slow. This article explains the steps you can take to replace the board in your mixer.
If you have a KitchenAid mixer that only runs at full speed when you turn it on, then you probably have a bad circuit board. Also called the phase board, a KitchenAid circuit board is easy to replace and the repair only takes about 20 minutes. A bad phase board may also be responsible for a mixer that won't run at all, but that problem can also be attributed to the control board, making both the diagnosis and repair significantly more difficult.
For this repair we used a KitchenAid stand mixer. The circuit boards differ by mixer type so before you begin the repair, make sure you find the right board for your mixer by using our KitchenAid product locator.
Before you remove the board you should note where each of the four board wires goes. This will save you a bit of time, though KitchenAid does label the wires in case your forget to check them.
1. Remove the rear cover
Remove the screw that secures the rear cover. Then you can remove the rear cover.
2. Remove the phase board screw
The phase board is fastened by a single screw. Remove the screw to free the phase board.
3. Disconnect the wires
Use a pair of needle-nose pliers to disconnect the wire connections.
4. Remove the board
Now you can remove the board from the mixer. It fits snugly, so you will most likely need to tilt it up over the control board to slide it out.
5. Install the new board
Now you can install the new board. You will need to slide it in and down to clear the control board.
Then you can set it in place and fasten the screw.
6. Connect the wires
Connect the four wires to the mixer. If you forget where each wire goes, KitchenAid labels them as follows: RW for the red and white wire, RD for the red wire, BK for the black wire, and BL for the blue wire.
7. Replace the cover
Now just replace the cover and fasten the screw to finalize the repair.
Replacing the circuit board on a KitchenAid mixer is an easy repair that anyone comfortable with basic repairs can perform in about 20 minutes. The repair only requires a screwdriver and pliers and will save you a lot of money compared to the repair shop.
Before you begin any appliance repair, be sure to get the right appliance parts with our easy-to-use parts finder.