Question about Bosch MUM6630 Universal Series Stand Mixer

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MUM 6622 Motor Has voltage to it but will not run!

Our bosch mixer just stopped running. I used a voltage meter to check the reset switch and to see if there was power to the motor. Reset is good and power is at motor terminals when switch is on ,but the motor will not run at all.

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I have the same problem after running for a while, turning off then back on. It will not start. I found the heat sink fuse in the motor was burning out. When the motor gets hot then turned off, no fan and the heat build up enough to melt the heat fuse. It would be an easy replacement if I could find where to get them. To find it on the motor, look at the wire going from one corner of the motor to another, but looks like it goes into the motor in between. Pull on that going into the motor to lift the heat fuse out.

Posted on Apr 11, 2009

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When I turn the machine on it makes a buzzing noise, (not loud but it might be like an alarm).


If the mixer is still running and making the buzzing noise one of the electrical contactors is making the noise and should be replaced.
If the mixer is not running and just making a buzzing noise it can be because off single phasing, check the incoming supply to the mixer and make shore you get the right voltage to the motor (test on motor connection terminals)if the voltage to the motor is right the motor might be faulty

Jul 29, 2015 | Hobart 60 Qt. Mixer

3 Answers

Dough hook & beaters slipping


you can generally find a local repair shop that specializes in resturant/bakery equipment/small aplliance. they will have the parts you need as well.. good luck please rate this

Sep 03, 2008 | Bosch MUM4420UC Compact Series Stand Mixer

1 Answer

I want to know the ages of Bosch Mixers mum 6610 and mum 6622. I cannot find a list of manufacture dates on these two models. I want to know which one is the newest between the two and if there is anything...


Well, the advantage of Bosch Mixer mum 6610 is best for large families because of its motor speed which is really high while bosch mixer 6622 is actually amazing, with a dough hook, it has softer bread, and basically idealist for any family. These machines are made to last so the best solution for you would be to contact your supplier so that he can give you specifics but hardly are given, all the same, the bosch 6622 is fantastic in comparison.

Jun 14, 2014 | Food Mixers

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Bosch universal mixer 800W. How do I change a 110 volt to a 220 volt? Is it possible?


Bosch is not very good about putting manuals or other documentation online for older products, so I'll have to give you generic advice.

Some electric motors have optional voltage connections. If your motor has this feature, there will be a box or removable plate on the motor with 110 Volt and 220 Volt connections inside. You would need to replace the line cord with a 220 Volt cord having the correct plug for the location you plan to use the mixer, and connect the motor "hot" wire to the 220 V connection in the motor junction box instead of the 110 V connection (the neutral wire goes to the same neutral).

If there is no such option available on the motor, you would also have to replace the motor with a 220 Volt version. Check the labeling on the speed control (inside the mixer) to be sure it is rated for 240 VAC, and check the power label by the power cord. If the label gives a single range of input voltages spanning both 110 VAC and 220 VAC (e.g., "Input 97 V- 265 V") then you only need to change the plug. Unless the electrical parts are all rated for 240 VAC or higher, conversion is not safe.

Some products (especially desktop computers) have a recessed switch on the back that lets you select either 115 VAC or 230 VAC input power. If you have this on the mixer, all you have to do is use a small tool to push it to the other position.

An alternative is to get a 230 VAC - 115 VAC transformer or inverter rated for at least 800 Volt-Amps and wire it with a 230 Volt plug on the primary side and a 115 Volt socket on the secondary side; then you can just plug in your unmodified mixer to this. If you cannot find a box like this, you can buy a "control transformer" from an industrial equipment supplier and put it in a suitable metal box. I recommend including a power switch and a 4 Amp dual-element fuse or breaker on the primary side circuit; you don't want somebody burning up the transformer with a 1200 Watt microwave oven or griddle.

Mar 17, 2011 | Bosch MUM6630 Universal Series Stand Mixer

1 Answer

Will not run


Will need to check if the motor is working the power to the switch and then to the motor.
Look for a reset switch on the underside which could have reset, this can happen if there is an overload on the mixer.
If the motor is not working check if the brushes are contacting, if not clean and set.

Oct 01, 2010 | KitchenAid K45SS Classic Stand Mixer

1 Answer

Have a A200 Mixer, when turned on, you have to spin it by hand then it runs fine. Whats wrong


The answer is clearly in the starting circuit which doesn't have too many parts, but depends on the type of starting circuit your mixer uses (electronic or mechanical start switch). I'm assuming your mixer isn't very old, as the old units used brushed motors which did not have starting circuits.

The parts of the starting circuit are the motor start winding, the start capacitor and the start switch (probably electronic in your case which is a small silver box with four wire terminals on it). The capacitor should be tested with a multimeter after verifying it's not holding a charge (check with multimeter set to DC Volts, mixer unplugged, should read zero volts).
Start winding should be tested with the meter to measure ohms. Locate the wires leading to the motor (hopefully only three wires) and you should get a reading for all three combinations of measurements (wire 1-to-wire 2, 2-to-3, 1-to-3) if meter indicates open on any of these, motor stator is bad(this is pretty rare and quite expensive).
Electronic start switches are not very simple to test, but if the capacitor and motor test out OK with the meter, and all the wiring is intact (look closely for loose wires, burned wires, poorly crimped terminals, etc.) then it must be the start switch.

May 19, 2010 | Hobart A200 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...

1 Answer

Mixer will not run.


Jeff, odds are that it's the circuit board. I've never heard of a motor burning out after just one use. Go to www.consumeraffairs.com and look under kitchenaid mixer problems. You'll find it less hard to believe that this can happen to a relatively new mixer. Welcome to the land of kitchenaid (Whirlpool Corp.) users. By the way, be prepared to wait at least a month for parts delivery. Things have changed greatly since Hobart sold the kitchenaid line. If you found this solution usefull, please rate it. Good luck. ricardok45

Jan 01, 2009 | KitchenAid KP2671 Professional 6 Series...

1 Answer

Bosch mixer doesn't run!


It sounds like the switch to me.mixers last awhile as long as there not overloaded.The brushes in the motor also go bad but i think the switch is your problem.Goto home depot/lowes and take the switch with you,dont forget to mark the wires.If they cant help you goto graingers (its a electrical/plumbing wharehouse).let me know,you can use an universal switch if the one you cant find isnt availiable.

Dec 10, 2007 | Bosch MUM6612 Universal Series Mixer

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