My Bosch WFK 2401 washer acts like it has a breaker blowing and reconnecting while it is trying to agitate and spin. I just replaced the brushes and not it seems that it does not have the power to turn the drum all the way over with a load in it. It tries to turn, clicks off, and then tries again at irregular intervals.
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Re: Washer won't agitate
This sounds like it is a relay on the module (main pcb) if the carbon brushes have been fitted correctly then there is a fault on the module, these items are replaced as a unit, i would also look to see if the machine has a capacitor fitted, this also could have the same effect and would be a much cheaper repair to start with, a capacitor is normally situated at the top where the mains wire enters the machine, its normally about 2 inches long and 1 inch round with 2 wires from it,
work with safety unplug before doing anything
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Most likely this means you have a belt problem, or the brushes have worn out. If you are confident, UNPLUG the machine, and remove the back cover. It will be obvious if the belt has come off, and you may be able to re-instal the old one, or buy a new one. Worn motor brushes will be less obvious, but if you're reasonably confident with electronics, you could remove the motor, and inspect the brushes, or get someone else to.
I just had the same problem last week Aug 1 2009 on our WFK 2401 purchased in 2001
If you hear no motor spinning when it should then it's something with the motor. If you hear motor spinning, esp spin cycle, but the drum doesn't spin, then probably broken belt ($30 part).
Since I work on cars (this is very much like an alternator+belt) and wanted to avoid a $100 service call (just to come to house) and at least try for a quick fix before buying a new washer, I opened the back, confirmed belt looked ok, so tried replacing the brushes in the motor, and it worked.
For a good description on how to do this see http://dossy.org/2007/05/lots-of-miles-on-our-bosch-wfk2401uc-washer-motor/ I took some pics, and time permitting will post more details to this dossy site to help fellow owners. I purchased the brushes at partstap.com for $50 (incl tax+ship)
Remove rear panel of washer.
Remove drive belt.
Unscrew the 2 bolts that hold motor to tub back.
Remove motor plug
Lever notor back with a screwdriver or similar, keeping a firm hold on motor.and remove motor
At the rear end of motor away from pulley you will see the brushes and the armature.
Remove brushes, and if there is less than 4 or 5mm of carbon left, then replace them.
Lightly clean the armature with emery cloth.
Refit in reverse order. Test.
Plz rate my solution.