Question about Bosch 24 in. SHY56A05 Stainless Steel Built-In Dishwasher

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Machine will not drain all water at end of cycle

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Have a look into the bowl at the bottom. If there is a cover held by a screw on the left side, take the screw out, remove the cover and check for some debris blocking the impellor.

Be careful as glass is the most common item found in the impellor.

I hope help you with this. Good luck.

Posted on Sep 07, 2009

  • ZJ Limited
    ZJ Limited Sep 07, 2009

    Another steps to check the pump; If the water is not draining from your dishwasher, verify the following:

    - Verify
    that there is not a clog in the drain hose or air gap. This is
    typically the reason that a dishwasher won't drain and the clog is
    usually where the drain hose attaches to the garbage disposal or sink
    drain pipe. Remove the hose and clear any clogs, then reinstall.

    - Verify
    that water from the sink drain is not making it's way into the
    dishwasher. I would recommend creating a high loop in the dishwasher
    drain pipe, which is attached to the sink drain, under the sink. The
    high loop can be fastened to underneath the countertop. This will
    prevent any water from entering the dishwasher from the sink; it also
    prevents the dishwasher drain water from making it's way back into the

    Verify that the pumps drain impeller is working. You can
    reach the impeller from inside the dishwasher after removing the lower
    rack, spray arm, and arm support. This typically involves removing a
    few screws. Once upper parts are removed, inspect the drain impeller,
    which pushes the water toward the drain port, for any cracks or missing
    blades. If the impeller is defective, the water will not drain properly
    and you would need to replace it.

    Verify that the drain
    valve is working; many are controlled with an electric solenoid that
    opens the valve, sending the water to the drain. There is a chance that
    the solenoid or the diverting lever could be stuck which would prevent
    the water to drain. If so, try to free up the solenoid and lubricate
    the lever. Otherwise the solenoid or pump assembly may have to be

    Verify that the motor is turning/ working and
    Verify that there is power to the motor. If the motor hums but doesn't
    turn, it may need to be replaced. Motors can get stuck if not used
    regularly. If the motor is defective, the water will not drain and you
    would need to replace it.

    There are ways to test the pump
    and motor with a multimeter. If you are not comfortable with doing
    this, you may want to have a technician test it for you.

    Good luck.

  • ZJ Limited
    ZJ Limited Sep 09, 2009

    Have you removed the filter?
    If it gets clogged the dishwasher wont drain. other wise is sounds like a faulty drain pump.


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