Bosch dishwasher won’t drain

Bosch dishwasher won’t drain. Sometimes a Bosch dishwasher won’t drain water. When this happens to you.

Here are some potential reasons why and solutions that can help you resolve this issue so your Bosch dishwasher again works well.

Bosch dishwasher won’t drain

bosch dishwasher won't drain

If you find yourself dealing with a Bosch dishwasher that’s not draining out water, you need to figure out the cause of this problem so it can be fixed as soon as possible.

If you take a look at the following list of troubleshooting tips, you’ll be able to diagnose your problem and get your Bosch dishwasher working like new in no time.

Broken Drain Impeller

When one’s drain hose breaks, it most often means that the drain impeller isn’t doing its job any longer. The water will drain away from this part into the gutter if this part is replaced.

Drain Solenoid Kit failure

The drain solenoid comprises the drain valve in dishwasher models where the pump is not integrated into the machine, opening and closing it to allow water to exit during a washing cycle.

If this system malfunctions, then water cannot leave the dishwasher causing it to flood.

Defective Drain Pump

Whenever there is a problem with the pump motor, the drain pump will not work. Flow is forced through the hose by an impeller.

In order to determine whether or not your drain pump is defective, you should check for a current by using a multimeter.

If there is no electric flow running through the motor, or if it does have power but still doesn’t operate, you’ll have to remove and replace your dishwasher’s drain pump.

Drain pumps are one-time use pieces of machinery so if it’s defective then that means you’ll need to purchase and install another one.

Faulty Drain Valve

Over time, the drain valve can get clogged with debris. This can hinder it from doing its job so you must clear away any clogs and ensure that water can flow through your valve.

If the drain valve is clear of debris but still won’t actuate then replace the drain. Drain valves generally do not need to be serviced, if a drain fails to actuate then you simply need to remove and replace it.

 Water pump belt is worn

The water pump belt may need to be replaced if it’s old or frayed. A pump belt is located on the bottom of the dishwasher motor, which is close to the slim water inlet hose.

You can remove it by opening up the machine from underneath and removing some screws from the front panel then you can access individual parts and replace them if necessary.

When replacing a pump belt, always make sure to replace it with another one of a similar size because belts for different models tend to vary greatly in size.

To find out what size you will require, turn your dishwasher on and go over to where the water inlet enters at the back of it.

Clogged Drain Hose

The drain hose that connects to the sink to complete the plumbing circuit may be clogged. To resolve this, remove both sections of the drain hose from the dishwasher and from under the sink.

Near the garbage disposer or dishwasher drains, the drain hose is most commonly clogged.

 Garbage Disposer issue

If you recently had a garbage disposer installation, chances are that the drain plug that was sold with the installation has been forgotten about.

The sink is designed to work perfectly fine without this plugin place but it’s important not to forget about it because it could cause issues down the line when the pipe is filled up with solidified water from food particles and other grime.

But if you’re certain there aren’t any issues related to a recent garbage disposer installation then there’s probably an obstruction in the pipe as mentioned above so make sure, whatever the situation is, you take care of it before moving on.

Replacement of Check Ball & Check Valve

When the dishwasher has been emptied, the check ball prevents water from returning to the dishwasher. Water will not drain through the check valve if the check ball gets stuck.

If the check ball becomes stuck, try freeing it first by hand and see if you can unblock it. If you can’t then you must open up the drainage pipe under your sink (this process could be different for each model of dishwasher).

Once inside take out all of the rubbish such as food leftovers and other objects that could have blocked your drainage pipe.

Once done close your dishwasher once again and wait a while to see if everything is working well now.

Otherwise, replace your check valve if necessary with a new one since it might have become broken due to too much use or just poor quality materials used when building it.

Related Guides