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Customer Questions and Answers for Dishwasher Float Switch by Bosch

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Manufacturer Part
4.89 (64)
By: Bosch
Part Number: OEM8407128
Manufacturer Part Number: 00165256

Dishwasher won't fill or keeps overfilling? The float switch detects water levels for proper filling and draining. Accessible repair in under 30 minutes.

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Questions & Answers

For Bosch Dishwasher Float Switch (Part Number: OEM8407128)

1 Answer

Clark, We will need to have the model number of your unit to be able to assist properly but check the float switch for being the issue and make sure that there is good water flow at the valve and make sure there are no kinks in the water line.

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1 Answer

BB, based on your description, you have a water heating issue " Occasionally dishwashers can run for hours, not finish washing & show a “1” in the display. This means the module has timed out due to an unidentified heating problem -- all heating related parts must be checked until the problem is found." You may want to start by checking the water temperature in the bottom of the tub on the first fill of a wash cycle, The water temperature should be 120 dgrs. F. then check the heater assembly 00480317 and sensor. Thanks,

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1 Answer

Marion, If you pull the unit out and look in the base you will probably find water in the float switch area. The defective part is the valve 00425458 that doesn't open all the way and lets water leak from the inlet assembly into the base.

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Brooke for Model Number SHU43C05UC/22

Dishwasher was running for maybe 10-15 minutes when I noticed an unusual smell (kind of like burned plastic). I stopped it, opened the door and no water inside. Detergent pack had been released and otherwise seemed to be running normally. I discovered water in plastic basin and on floor below, and the float switch was engaged. Leak seems to be from bottom seal of door, which I will replace. Am I correct in assuming that the float switch shut off the water inlet? If so, shouldn't it have also not allowed the machine to operate and triggered a code as well? And should I be concerned about the smell or any damage caused by running it dry?

1 Answer

Brooke, You will need to pull the unit out and check the water inlet system on the left lower side when facing the unit. When the unit is removed from the cabinets remove any side panels where you can see into the base of the unit. Start a cycle and let the unit fill looking all over for the leak. Pay attention to the left side water inlet system.A faulty valve will let water leak from the air gap in the inlet.

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1 Answer

Lester, You will want to check to see if there is 120 vac getting to the pump. If there is then this will be a faulty pump. If there is not then this will be a control module issue.

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1 Answer

ML, Unfortunately we would not have any information on the float switch for this model on whether this float switch is normally closed or normally open. According to the model number this float 00165256 will be the correct one for your unit.

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1 Answer

ML, Unfortunately the switches may be different as one may be normally open and one normally closed with the button not being pushed. You would have to check this to determine if they match up. If they do they would be able to use the same and if not then will need both individual switches.

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1 Answer

Omer, This issue would most likely be caused by a issue with the control board if the drain motor is coming on the same time the unit is draining.

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1 Answer

Mike, You will want to check to make sure that there is no issue with the unit heating, make sure that the drain has not gotten clogged. If these check ok then it sounds like the control module would be the issue with the unit.

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