Question about KitchenAid K45SS Classic Stand Mixer

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Mixer speed settings

Mixer revs up and down continuously , at all speeds .... phase control board ??

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  • greenvalley Apr 07, 2008

    It was the phase control board , thanks

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

Posted on Mar 25, 2008

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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


If it does not start at all until you get to speed 10 then look for a broken wire an any of the wires NOT associated with the phase board. Highly unlikely since you have just been there. Next look at the operation of the switch low down inside the black speed control board. There is a primitive switch there operated by a shaft from your speed control lever. You may find the switch is not activating until it gets right up to speed 10. Have you checked the carbon brushes? The phase board you have just done is normally the culprit for your problem.

Dec 20, 2014 | KitchenAid KSM75WH WhiteTilt-head Stand...

1 Answer

Speed control


The first thing you need to do is remove the end cover on the mixer, there is a screw at the top you need to undo then in an upwards motion you should be able to pull that off. behind there is the speed control plate. there are two screws at the top, and one at the bottom, the two at the top need to be adjusted the same amount, to speed up the mixer you turn the screws out, to slow down, you turn them in. you want to do each screw 1/4 turn, then test the mixer, see if this will slow the mixer down, so it regains the other speeds. If this adjustment does not work, then the problem will be the phase control board, that is part number W10325124, we sell the board, here is a link to that on our website: http://www.mendingshed.com/kaphaseboard.html.

Also, here is a link to the service manual for your mixer, it will go into more detail on taking the back cover off, and adjusting the speed control plate. Also if you do end up needing to replace the phase board it will show you how.

Service Manual: http://ep.yimg.com/ty/cdn/mendingshed/kitchenaidservicemanual.pdf

If you have any questions feel free to call us.

Colleen
The Mending Shed
801-225-8012

Mar 21, 2014 | KitchenAid Food Mixers

1 Answer

Kitchenaid Hobart K45SS when set at 1-2 accelerates to high speed when making dough. How can I fix this?


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

Apr 24, 2013 | KitchenAid Food Mixers

1 Answer

KitchenAid k5a arcing on control board


it was stuck on high speed because the phase control board went out, your fix may not be absolutely 100% and it is now causing an uneven distribution of the electric charge in the mixer and it is arching. My recommendation is to replace the speed control board (black and copper plate) and the phase control board. i bet it fixes the problem as these are the two parts that regulate the electricity in the mixer. Hope that helps. Buy the way if you don't fix the problem and continue to use the mixer you may have to replace the motor eventually as you can cause the armature and stator to short or burn out.

Feb 03, 2013 | KitchenAid K5ADH 5 Quart Mixer Dough Hook...

1 Answer

My kitchenaid mixer run on high at all times


If your mixer only runs on high speed there are 3 things that can cause that. The first thing to check will be the speed control plate, Remove the trim and end cover on the mixer, the first thing you should see is the speed control plate, this has 3 screws on it, try adjusting the top two screws 1/4 turn, this should slow the mixer down, do not over tighten. Also check to see if the control plate spring is unhooked. If the spring is unhooked, attach to bottom of the control plate, and squeeze the spring end.
If this does not fix your mixer, check the wiring of the mixer, you can locate a wiring diagram on the last page of the service manual.
If the speed control plate is adjusted correctly and all the wiring is correct it will be your speed control phase board. You can test the speed control phase board to see if it is shorted. With the line cord disconnected, pull the t-b ar 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, teh phase control board is defective and needs to be replaced.
Here is a link to the service manual: http://lib.store.yahoo.net/lib/mendingshed/kitchenaidservicemanual.pdf
This will aid you in taking the mixer apart, troubleshooting and putting it back together, remember the wiring diagram is the very last page.
Thank you,
Colleen
Customer Service
MendingShed.com
800-339-9297

Jan 07, 2013 | KitchenAid K5SS Mixer Speed Control Plate...

1 Answer

HOW TO TEST A PHASE CONTROL BOARD ON KITCHENAID MIXER


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

Oct 18, 2012 | KitchenAid K45SS Classic Stand Mixer

1 Answer

Mixer doesn't work on all speeds


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.

Sep 20, 2012 | KitchenAid K45SS Classic Stand Mixer

1 Answer

Motor noise


It has been my experience with knocking kitchenaid is one of three reasons all related to the speed control of the mixer1 speed control board adjust speed screws2 speed Phase control board, needs replacing3 The motor governor behind the speed control board needs replacing
Speed board = $9.00Phase Board = $20.00Governor = $10.00Your time + one week for ordered parts asnd one hour to remove and replace.

all work is performed at the rear of the mixer and you need only a phillips #2 screwdriver, a pair of needle nose pliers, an 11/32 open end wrench (you will need this to adjust your speed control board after new install) and that's it. easy work all remove and replace. Oh! make sure that you pit some thermal paste behind the phase control board to avoid burn out.


But!!! before you buy parts and do all that, try adjusting the speed contol board first. Go here for a parts list for your model.


http://shared.whirlpoolcorp.com/product_literature/search_results.jsp?searchTerm=KV25G0X&siteCd=KAD&userType=Servicer


then go here for instructions on tuning the mixer speed.
http://www.youtube.com/watch?v=pUo_ZU5xh3o

if after you tune it you still get the knocking then use the parts list to order parts. two good parts sources are goodmans.com and mendingshed,com, they are reliable and have the parts in stock.

Aug 26, 2012 | KitchenAid KV25G0X Stand Mixer

1 Answer

The mixer motor starts and stops, it will not continue running on any speed. By playing with the speed selector you can get it running sometimes but you cannot keep it running if you change speeds.


Here is how your speed control works:

Speed Control
The speed control of the mixer is attained through the use of a governor assembly mounted at the rear of the control plate assembly.
The electrical circuit is made and broken by the action of the fly ball governor revolving against the control plate.
When the switch lever is moved to an ON position, the position of the control plate with respect to the governor is changed by the action of the switch lever.
Thus, when the control plate is set close to the governor, a relatively low speed of the motor causes the governor to make or break the mixer’s electrical circuit through the control plate.
When the control plate is set farther away, a greater motor speed is required before the governor starts breaking the circuit.
The action of the governor is such that the speed of the motor will remain constant for a given setting of the control plate within certain loads.
After certain loads have been exceeded, the speed of the motor will drop to meet the torque requirements of the given load.
Speed is controlled by the governor and the control plate in conjunction with the phase control.

TRIAC RMS VOLTAGE
BOTH CONTACTS OPEN - 40 VOLTS
ONE CONTACT OPEN - 80 VOLTS
BOTH CONTACTS CLOSED - FULL VOLTAGE
NOTE: The triac regulates the power the motor sees depending on control board contacts.
A device called a triac is a part of the phase control circuit.
This device determines the amount of power the motor sees dependent upon the condition of the control board contacts.
If both contacts are open, about 40 volts RMS is applied to the motor and about 80 volts is applied when either contact is closed and the other is open.
When both contacts are closed, the triac is full on; consequently, full power is applied to the motor. In this way, the speed is controlled.
If the mixer motor begins to run too fast for a
particular speed setting, one or both contacts open, which cuts back on the voltage the motor sees, thus slowing it up.
If the motor operation becomes too slow, one or both contacts will close, applying the needed voltage to the motor to sufficiently increase motor speed.
This is always accomplished through the triac.
The control plate contacts control the triac, and in turn, controls the amount of power supplied to the motor.

The control Plate for your mixer is PN
W10119326
http://www.marbeck.com/mixers_kitchenaid_parts.html

If your not good with tools / meters or tedious repairs do NOT attempt this yourself.
The service manual for your mixer can be found here
http://www.f-ems.com/download/DownLoad.aspx?DocsID=082009012917

and is:
LIT4177310-C


Mar 14, 2010 | KitchenAid KSM103 Professional 5 Series...

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