I Have a Bosch Dishwasher That Doesn't Drain

Written by misty faucheux
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Bosch is a German technology company that sells consumer appliances worldwide. It offers different types of dishwashers, including ones with custom panels and concealed controls. Water must drain from your dishwasher for your dishes to dry. If water isn't leaving the tub, troubleshoot and repair these problems to avoid costly service fees. If you need replacement parts, purchase them from authorised Bosch parts dealers.

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Normal Operation/Motor

Your Bosch dishwasher normally has a little water left in the tub after the cycle is finished. This keeps the seal moist. If you see a lot of water on the base of the tub, verify that the cycle is actually done. If water still isn't draining, disconnect the dishwasher from the power source, and check the motor. If you haven't used the dishwasher in a while, the motor can get stuck. Rotate the motor until it moves freely. If the motor creates an electrical burning smell or if it doesn't turn, replace it.

Drain Hose/Clogs

If water isn't draining from your Bosch dishwasher, check the drainage hose on the back of the dishwasher. See if the hose is kinked, and straighten it if necessary. Clean out the drainage hose if clogged, and remove any limescale build-up. If the hose is completely crushed, you must replace it. Clean the air gap and filters if dirty. The air gap is located near the sink. Check your sink drain. If the drain is backing up, you must clean your household pipes and the drain. Install a high drain loop at least 18 inches above the floor and underneath your cabinetry. This prevents water from the sink from entering the dishwasher.

Drain Valve/Garbage Disposal

The drain valve is located on the base of the dishwasher. It opens and closes, draining dirty water out of the tub. If the valve won't open freely, verify that nothing is blocking the valve. Remove any dirt caught in the valve. If the valve is stuck, lubricate the lever. If it's still not working properly, replace it. If your Bosch dishwasher is connected to a food waste disposer, run the disposer to clear out any food caught in it. Remove the knockout plug if you just installed the dishwasher.


The pump is responsible for moving water out of the dishwasher at the end of the cycle. The pump is located under the spray arm and lower rack. Remove these items, and examine the pump. Use a toothpick to clean out the pump if food particles are caught in it. Look at the pump impeller. If it is cracked or completely broken, you must replace the entire pump, since it's difficult to fix just the impeller.

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