Question about Bosch 24 in. SHU43 Built-in Dishwasher

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Bosch SHU43CO2UC/22 will not drain

I have had this diswasher for about 3 years and has worked great up until a week ago. The problem is the water doesn't drain after the wash cycle. I used my shop vac to vacuum upo the water and ade sure the drain was not clogged but it still wont drain I dont think its the pump because the spray arm is working normally. Does any one if there is a pump for the wash cycle and a seperate pump for draining? Or could it be a bad relay/electronic module? Thank in advance. Kevin

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  • ktkaroll Jan 05, 2009

    Yes - the impeller was blosked thans to all for your help

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I had the same problem on Christmas Eve. It turned out that the impeller blade was blocked by a grain of uncooked rice which had found its way through the filters in the bottom of the dishwasher.

The impeller pumps the water out of the machine and is separate to the pump which sends water out of the spray arms.

If you have the user manual for the dishwasher, you will find instructions and a diagram of the parts in the troubleshooting section, but it is fairly straightforward.

To get to the impeller, remove the food filter from the bottom of the dishwasher (it simply lifts out) and then you will be able to lift out the metal filter grid and pull it out towards the front.

This will expose the plastic outlet where the impeller is housed. To reach the impeller, undo the cover which is held on with 2 torx screws, and you will be able to see the impeller blades. Try turning the blades, they should move without any resistance. If they are stuck, try using tweezers to find and remove the obstruction so that the blades move freely (there will be some slight resistance from the magnets around the impeller, but the blades should move easily).

That solved my problem, and I was able to spend Christmas Day without washing up by hand! I hope that it works for you.

Posted on Jan 04, 2009

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There is a seperate pump motor and rotor that empty the machine.
The rotor is in the sump under a cover held by a screw visible in the bottom of the sump.
Remove the little cover and examine the rotor for damage. It should be clean of debris and symetrical.
If this is all ok, you might have had a failure in the drain motor itself. Mine failed when the seal on the little rotor shaft failed allowing water into the armature space.

I replaced the unit about $75 from sears parts. It is not an easy dissassembly but the actual pump just clicks out and click in - easily. Getting the base off to do the job requires experince and knowledge as you are exposing the electrical system.

I am not so pleased wit our 6 year old Bosch as - the rotor on the main pump failed, one of the main pump hoses failed big mess and now the drain pump failed strike three for bosch.

Posted on Jan 10, 2009

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1) Remove the cover from the air gap at the top of the sink (usually a short chrome domed cylinder that sits at the back of the sink), and, using a wire, clean it. Also check the entire length of the drain hose for kinks and blockages, especially at the drain connection to the disposer or drain line.
2) Once the dishwasher is cool, shut off the power to it, and—if your dishwasher is made to allow this—remove the strainer, located under the bottom spray arm at the base of the cabinet (see illustration). Unscrew the hubcap, lift the spray arm off, and remove any clips that hold the strainer to get it out. Scrub it clean with a brush, and then replace it.

3) Determine whether the sink trap or house drain line is clogged.

4) If the dishwasher still doesn't drain properly, the drain hose may be clogged or the drain valve may need replacement. At this point, it's usually best to call a repairperson. You can check the drain hose for obstructions, but this sometimes involves pulling the dishwasher out from under your counter to access the hose, disconnecting the hose at both ends, and flushing it out with a faucet or garden hose.

Thanks for using FixYa

Posted on Jan 07, 2009

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Following a cycle, a small pool of clean water inside the tub is typical. Excessive water means the pump isn't pumping water out properly, the drain hose isn't carrying it to the drain pipe, or the house's drain lines are backed up. 
If dirty water spews from the air gap, the drain line is kinked or clogged. Note: If you've recently installed a garbage disposal, be sure the knockout plug for the dishwasher was removed when the connection was made (see your disposal instructions).






1) Remove the cover from the air gap at the top of the sink (usually a short chrome domed cylinder that sits at the back of the sink), and, using a wire, clean it. Also check the entire length of the drain hose for kinks and blockages, especially at the drain connection to the disposer or drain line.

2) Once the dishwasher is cool, shut off the power to it, and—if your dishwasher is made to allow this—remove the strainer, located under the bottom spray arm at the base of the cabinet (see illustration). Unscrew the hubcap, lift the spray arm off, and remove any clips that hold the strainer to get it out. Scrub it clean with a brush, and then replace it.

3) Determine whether the sink trap or house drain line is clogged.

4) If the dishwasher still doesn't drain properly, the drain hose may be clogged or the drain valve may need replacement. At this point, it's usually best to call a repairperson. You can check the drain hose for obstructions, but this sometimes involves pulling the dishwasher out from under your counter to access the hose, disconnecting the hose at both ends, and flushing it out with a faucet or garden hose.

Thanks for using FixYa

Posted on Jan 03, 2009

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Yes it dose have small drain pump seprate.most dishwasher drain problems are at the air gap or disposer at the sink that those areas apart and inspect and clean ,work your way back to the dish washer from there

Posted on Jan 03, 2009

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