Kitchenaid mixer will not run on speeds LOW SPEEDS only runs on speed ten. I've replaced the phase board and that was not the issue. what else could be causing this problem

It's a 110 volt 1200 watt mixer and you are supplying it with 220 volts 500 watts of electricity through the inverter.

https://www.walmart.com/ip/110V-Stand-Mixer-1200W-6-Speed-Tilt-Head-Electric-Food-Mixer-Dough-Hook-Mixing-Beater-Whisk-Splash-Guard-4-2QT-Stainless-Steel-Bowl-Red/353191351

Now for the odd part, an 'inverter' takes a small number of volts usually 12 volts DC (direct current) and inverts it into 110 volts AC (alternating current) inverting the sine wave at 60 cycles per second..

If you have a 220 volts supply and want to power an appliance that is 110 volts, you need a TRANSFORMER not an inverter. You are taking 220 volts AC and transforming it into 110 volts AC. That transformer needs to be able to supply more watts than your appliance. In your case 1,500 to 2,000 watts output. Something like this. My advice, buy a new mixer, sell the old one back home.

https://www.amazon.co.uk/MSKJ-Converter-Transformer-220V-110V-Appliances/dp/B07CPNTNDD?th=1

..

It sounds like two issues, the first is going to be the phase board, you will need to replace it, that should fix your speed issue.

The second issue will be a stripped gear, in that mixer there is a nylon gear that commonly goes bad, that would be the worm gear.

Here is a link to the phase board: http://www.mendingshed.com/kaphaseboard.html
Here is a link to the worm gear:
http://www.mendingshed.com/kawormgear.html

Also here is a link to the service manual: http://ep.yimg.com/ty/cdn/mendingshed/kitchenaidservicemanual.pdf

The service manual will show you how to take apart the mixer, and put it back together.

Usually when the mixer runs only on high speed it is caused by the control plate adjusted incorrectly or the control plate spring unhooked. Remove the trim & end cover on the mixer and check the control plate spring, if unhooked, attach to bottom of the control plate and squeeze the spring end, also check the speed control plate screws,there are 3 screws on this plate, one at the bottom two at the top, see if adjusting the top screws slows your mixer down.
Next check the wiring of the mixer, Insure everything is wired correctly, to get wiring diagram go to the last page of the service manual. Here is a link to the service manual: http://lib.store.yahoo.net/lib/mendingshed/kitchenaidservicemanual.pdf
If neither of those fixes the problem it is probably a bad phase control board, or a shorted phase control board. With the line cord disconnected, pull the t-bar contacts to open and insert a piece of paper between them so they cannot close. Reapply power-the mixer should just run or buzz trying to run, if it operates at full speed the phase control is defective and needs to be replaced.
Use the service manual to aid you in taking apart the mixer, trouble shooting the problem and putting the mixer back together, based on the mixer only running at high speed some of the time I would assume it is the speed control phase board.
If you have any questions let me know.
Thank you,
Colleen
Customer Service
MendingShed.com

I am sorry to say but only with a new one, about 30 bucks and five minutes of work, but if your mixer has any speeds working except only high (only high means it is the phase control board) then it is more likely the speed control board is bad rather than the phase board. Can you send is more info on what happened when the mixer started or stopped working. We can be of more help with more info

First the K45SS does not have a hall effect sensor. the pro series the epicurean seines and the pro series 5 use them, The K45ss system uses a phase control board a speed control plate and a governor for speed control. the governor rarely goes out the phase control board is a likely culprit but the system would work only in high gear if it was bad. I agree with the guest above in that it sounds like the retaining nuts on the adjusting screws of the speed control board have worked themselves loose and the adjustment screws themselves have vibrated out of proper position.

Hi, It could be the variable speed switch. (bad) Replace it for a new one. Good luck.

Obtain a copy of the Repair Part List for your model from Kitchenaid.com.
Download a Copy of the Kitchenaid Service manual.

http://www.kitchenaidparts.be/centers/servicemanual/mixer.pdf

First, you may want to adjust the mixer's speeds:

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

Second, if the mixer won't run:
Remove the Control Plate Assembly (36), the Phase Control Board (39)
and the motor Governor Assembly (35). Inspect for loose connections,
burnt or damaged components. If they seem to look OK, re-assemble
them and test the mixer. If the motor still won't run, then I might suspect
a defective Phase Control Board (39).

Referring to the following parts description:

http://shared.whirlpoolcorp.com/assets/pdfs/literature/Repair%20Part%20List%20-%208212369.pdf

The speed is controlled with a combination of the governor assembly #24 which mounts on the motor shaft, and the phase control board #27 which is mounted on the back of the mixer.

They operate in conjunction with item #25, the control plate assembly.

WARNING SHOCK HAZARD. FOLLOW THESE STEPS ONLY IF YOU ARE COMPETENT WORKING AROUND HOT ELECTRICAL COMPONENTS AND FOLLOW ALL SAFETY PRECAUTIONS!!!

Remove the rear cover screw #37 and the rear cover #36 and examine the governor when it is running. Also watch the speed control lever mechanism as you move it from off to the highest speed watching for binding etc.

If the governor appears to be opening and closing as the speed increases and the linkage is not binding then the problem is most likely the Phase Control Board, item #27.

Yes it is compatible. You may also have a problem with the control plate

It could be the phase control, or it could be that the governor assembly or associated spring is missing or malfunctioning.