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HardlySlept

Bosch SHE6AF02UC/02 Drain Pump Keeps Cycling

14 posts in this topic

I'm stumped with a problem on my Bosch (model SHE6AF02UC/02) dishwasher. The drain pump cycles on and off even though there is no water. If I add some water, it will pump out, but the cycling continues. I cannot start the wash cycle. Seems that the unit is getting a signal telling it to finish draining. The only float I can find is the dome shaped one in the middle of the bottom of the tank. I can hear a click of a switch when I move that float up and down. I have slid the unit out from the counter and looked for additional sensors, but I'm not seeing anything. Any ideas?

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There is another float under the tub in the base of the unit, if it's constantly draining when turned on there is water in the base. Clean up all of the water and leak test the unit.

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Can you tell me where the second float is?

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I'm just seeing the one float assembly but with two parts: one inside the wash basin and one in the base pan.  But I've not worked on many of these Ascenta models so I may be missing something:

 

gallery_4_7_99427.png

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That is exactly what I'm seeing. There is a linkage that can be reached from underneath and I can lift the float up, hear the microswitch clicking. I know I'm missing something simiple! I noticed this morning that the pump will run with the door open or closed. 

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Check your drain hose for proper installation.  Should be a proper gooseneck where the drain hose connects to the disposer or sink drain to prevent siphoning or backflow.  Remove the sump filter and add water to the sump until filled.  Then lift the safety float until switch activates.  Once water drains out, release the float.  If water backflows into the sump, the backflow (check) valve may be stuck open.  Clean sump and backflow valve.  If necessary, replace backflow valve.

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Siphon loop is good. Checked for backflow, none...

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Have you removed the toe kick yet to see if there's water in the base?

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The kick cover is off. I don't know how to check the base for water. I've just been checking inside, at the drain.

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Have you removed the toe kick yet to see if there's water in the base?

There is no base pan in the Ascenta model.

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There is no base pan in the Ascenta model.

That explains why I couldn't figure out how to do it! Any thoughts?

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There is no base pan in the Ascenta model.

 

 

Brother jumptrout speaketh much truth.  It's really just a base plate, a structural component.  The float switch in the base plate is only actuated by the float in the basin of the dishwasher, not by leakage onto the base plate.  The float switch can, however, become flakey like any switch can and this is probably what's happening with your dishwasher.   Float switch part link:  http://repairclinic.com/PartDetail/Switch/611665/1559881

 

Replacing float switch is the essence of joy itself.  You'll need to remove the dishwasher and flip it upside down.  You'll definitely want the manual for this:  http://appliantology.org/files/file/637-bosch-ascenta-dishwasher-repair-instruction-manual/

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I think I'll pull the wires off the float switch and ring them out, figure out what has continuity and when. Then, with a couple of jumpers I can 'trick' the machine into 'thinking' the float is up or down. I suppose I should figure out this apprentice thing, too. That way I can download the manual!

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Even in diagnostic mode this models control will happily point toward a problem with the safety float or switch which may not be the problem.  There may been a one time temporary drain obstruction causing the control to keep running the drain pump.  Try resetting the control using the following two steps:

 

1)  With the door closed and the dishwasher turned on, press and hold the Start button for 5 seconds.  If your model has a display it should show "01" of "00".  Press the On/Off button (turning the dishwasher off) and the control should be reset.

 

2)  If step one didn't work, remove the toe kick and disconnect the drain pump wire harness from the drain pump.  Make sure the connector isn't touching anything, tape it if necessary.  With the door closed, press the On/Off button turning the dishwasher on.  You should hear the control turn on and the relays click on and off.  Wait about 30 seconds with the power on, then press the On/Off button to turn the dishwasher off.  With the power off, reconnect the drain pump harness and reinstall toe kick.  With the door closed, press the On/Off button to turn dishwasher on.  The control should be reset.

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