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DW hangs up in wash/rinse cycles

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You've done everything possible with the heating parts. The first failure suspect in the line is the selector switch. Choose

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Old 02-12-2008, 07:37 PM
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Model Number: SHU4002 UC/U6   Brand: Bosch   Age: 1 - 5 years   

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You've done everything possible with the heating parts.

The first failure suspect in the line is the selector switch. Choose the "regular" cycle and check for continuity across the terminals 1 & 2, 3 & 4 and 5 & 6. All circuits should be closed.

If anyone is open - replace the selector switch.

If there is nothing wrong - replace the timer.

- The part number for the selector switch is AP2804338

- The part number for the timer is AP2804275

Here are the break down diagrams and the wiring schematic for the Bosch dishwasher Model SHU4002 UC/06

Gene.


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  #2 (permalink)  
Old 02-14-2008, 12:43 PM
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No doubt the selector switch caused the problem. It has to be replaced.

Gene.
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Old 03-15-2008, 10:24 PM
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I'm glad you were able to fix it.

Gene.
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  #4 (permalink)  
Old 06-22-2008, 06:23 PM
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Default Similar Problem

Hi Gene

I've been troubleshooting a similar Problem as OrvD. Timer gets stuck. I short the temp sensor on the front door and the cycle completes. We only use the Power Scrub cycle. I just replaced the temp sensor on the bottom near the heater too see if that was the culprit, I replaced the temp sensor on front and the cycle didn't complete. Heater ohms out to about 11 ohms.

I measure the following with the connector attached to the control board

sw 1-2 , 3-4, 5-6

Reg C , C, C
Del O, C, C
Rinse C, O, O
Scrub C, O, C

And with the connector disconnected :

sw 1-2 , 3-4, 5-6

Reg C , O, C
Del O, C, C
Rinse C, O, O
Scrub C, O, C

All are the same except for Reg cycle which we don't use. Is C, O, C correct for the power scrub cycle?

Tim
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Old 06-23-2008, 01:27 PM
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Hi Tim,

What is the complete model number of the dishwasher?

Gene.
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  #6 (permalink)  
Old 06-23-2008, 01:32 PM
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Default Bosch Model #

Shu 4006uc/u06

On another note. How long should a dishwasher last? Any preference for brands? Our #1 requirement is reliability and then low noise.

Last edited by tmorin : 06-23-2008 at 01:46 PM.
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Old 06-23-2008, 08:20 PM
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Hi Tim,

The push button switch is not good due to the testing results you posted: C, O, C for "regular" is wrong. It's hard to say what else could be wrong because of the age of the dishwasher and lack of technical documentation for such an old model.

I believe Bosch is a very good dishwasher. It is very silent and is designed very professionally.

Reliability today is not like it used to be 15-20 years ago on everything. If you decided to buy a new dishwasher, make sure you will get good manufacturer warranty and it could be a good idea to buy an extended warranty (if it's reasonably priced).

Here are the break down diagrams for the Bosch dishwasher Model SHU4006 UC/06

Gene.
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Old 06-24-2008, 05:40 AM
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Default Switch

Thanks a bunch Gene

I'll post a reply when the switch comes in.

Tim
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Old 07-07-2011, 07:41 AM
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Many thanks to OrvD and Gene for the valuable info in this thread.

I have a Bosch SHU3012UC/U06 with the same problem (dial sticks at 5:00 and 9:00).

I have tested the continuity of the selector switch for each cycle (with the harness disconnected).

Closed = Continuity
Open = No Continuity

Results as follows:

CYCLE 1/2 3/4 5/6
Scrub C O O
Regular O C O
Rinse C O O

For my model of Bosch dishwasher, is this considered normal or do I have a bad selector switch that needs to be replaced?

Last edited by gblotter : 07-07-2011 at 07:47 AM.
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  #10 (permalink)  
Old 07-07-2011, 02:26 PM
OrvD
 
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Default Selector switch replaced - problem solved

From my experience your problem is the selector switch, and it's easy to replace.

After replacing the switch, my curiosity led to disassembly of the old switch. It works a bit different than I had thought as each button completes a combination of contacts, which helps explain why a weakness in one contact causes more than one stoppage point in the cycle.
I also found the switch was not nearly as sturdy as I had expected or hoped. By scrimping on a bit of plastic the manufacturer has lowered the durabilty of this switch.
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