Question about Bosch 24 in. SHU43 Built-in Dishwasher

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Bought the display unit and water will not work.

My wife bought the display, Bosch (SHU43C). I removed our old Whirlpool and connected the Bosch. I turned it on and all I get is a low humming noise. The timer shows 49 and then after a few seconds it goes to 0 and continues the low humming. I assume this is a motor. I have tried all cycles. Any suggestions?

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  • 75 Answers

Hi there the low humming noise that you are getting sounds like the fill valve, this could be due to you perhaps not turning the water back on after fitting the new dishwasher or the fill hose being kinked when the dishwasher was put back ,hope this is of some help to you.

Posted on Dec 08, 2007

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Posted on Jan 02, 2017

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I have the same dishwasher and started experiencing the same problem last week. It is now fixed (at least for the moment). Here's what I did first. I checked the drain pan under the machine for water(none), the heater for continuity(okay), the float for binding(none), and the float switch for proper functioning(okay). I tried turning the ckt breaker off for a couple of hours to see if that would reset the control module(no effect). I then dissasembled the front door and removed the control module. I had previously read about the common problem of a cold solder joint on the heater relay pin on the control board. My heater was working and the joint looked good but I resoldered it anyway. I reassembled everything and it worked perfectly! My conclusion is that it was either a cold solder joint that was somehow causing the problem or a connector issue that got resolved during my disassembly/reassembly. Hope this helps.

Dec 21, 2008 | Bosch 24 in. SHU43 Built-in Dishwasher

1 Answer

Bosch SHU43C installed in 2003


My Bosch SHU43C had the same exact problem. I found the below solution on this site. Perhaps you already seen it.

My SHU43C is just over 3 years old. I had a similar problem recently. First, there were a few floods. Then, the Bosch only drained non-stop. Even when I used the Cancel Drain buttons the drain pump would run without stopping. When I tried to run one of the cleaning cycles, no water entered the machine. Corrective: I removed the base plate, and saw that the red plastic floatation device was in the up position. Using a flashlight and a wooden spoon, I lightly toggled the red float stem down. I pushed regular clean cycle and kept toggling with the red float stem until the rinse water started to enter the machine (turning the red stem seems to also actuate a step in the program). Now the dishwasher runs normally. Voila!

Aug 07, 2008 | Bosch 24 in. SHU43 Built-in Dishwasher

2 Answers

Bosch SHU43C


My SHU43C is just over 3 years old. I had a similar problem recently. First, there were a few floods. Then, the Bosch only drained non-stop. Even when I used the Cancel Drain buttons the drain pump would run without stopping. When I tried to run one of the cleaning cycles, no water entered the machine. Corrective: I removed the base plate, and saw that the red plastic floatation device was in the up position. Using a flashlight and a wooden spoon, I lightly toggled the red float stem down. I pushed regular clean cycle and kept toggling with the red float stem until the rinse water started to enter the machine (turning the red stem seems to also actuate a step in the program). Now the dishwasher runs normally. Voila!

Jun 22, 2008 | Bosch 24 in. SHU43 Built-in Dishwasher

1 Answer

Bosch SHU43


Sounds like the control module is out -- cost about $100 (I am on my third). I got a "lifetime" warranty when buying my second one. If you are handy, you can replace it yourself. You can call Bosch to confirm this (I did). It mounts inside the door. Mine is a BOSCH 5316.

The draining problem may mean a clogged drain hose -- you have to check it all the way back to either the main drain or the garbage disposal (if you have one). This may be what forced off the impeller wheel.

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