Bosch Dishwasher Not Draining (How I Fixed This Easily!)

Dishwashers are such an amazing invention!

You simply can rely on them anytime you need to get your dishwares cleaning done while saving extra time.

But what the heck do you do when they get broken?

If your bosch dishwasher is not draining, there are a lot of factors responsible for this. This includes a clogged drain filter, pump, impeller, malfunctioning solenoid valve, air gap issues, the garbage disposal, and many more.

Be rest assured that I’ll be highlighting the ways to fix this problem in the article ahead and most importantly the potential causes.

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Why Is My Bosch Dishwasher Not Draining?

The main and straightforward reason why a bosch dishwasher isn’t draining is mostly because there’s a blockage somewhere in the components.

What I did when I noticed my bosch dishwasher was not draining was to immediately troubleshoot some of these potential causes.

In order to gain a better understanding, I’ve compiled a table that contains the main reasons why your dishwasher might not be draining.

In addition to the quick fixes you are expected to carry out!

The probable causesQuick Fixes
1.Clogged drain filterRemove all forms of debris or clogs in the filter.
2.Defective Drain PumpClear obstructions, remove debris or replace.
3.Kinked drain hoseStraighten the hoses and clear the inside to remove blockages.
4.Clogged air gapWash and clear the air gap with running water.
5Stuck check valve and ball Clean the check valve or replace if problem persists.
6Obstructed garbage disposalRemove the knock-out plug and clear debris.

Now, let’s go through the detailed analysis of these points highlighted in the table above.

#1. Defective Drain Pump

My bosch dishwasher is not draining

You needed to inspect all of the drainage components in your dishwasher. One common component that could be a culprit is the drain pump.

The drain pump helps to pump water out of the dishwasher with ease.

If the bosch dishwasher drain pump is damaged or clogged, waste water would get stagnant and this results in the appliance having difficulties with draining.

Some other related potential problems are the drain filter, impeller and drain hose.

  1. Clogged drain filter – The filter works to prevent debris and loose food particles from getting deposited onto your dishes. It then traps them in the process. Note that your dishwasher might not drain if the drain filter is clogged.
  1. Damaged drain impeller – The impeller is what the drain pump uses to force water through the drain hose. This is another thing that can potentially prevent your dishwasher from draining.
  1. Clogged drain hose – I’m sure you should be familiar with the drain hose. It mainly carries waste-water out of the dishwasher. If the hose is kinked or there’s debris or blockages in the hoses, it gets stuck and water won’t be able to flow properly as a result.

How To Fix?

Remove obstructions or replace the pump

Actually this is totally DIY which means you can do it all by yourself without the need of specific tools.

What you need to do is get access to the drain pump which is usually at the bottom of the dishwasher. 

You can clear it out to ensure there’s no blockage such as foreign objects. Sometimes the drain pump might need to be replaced if it’s defective.

Remove debris in the filter and hoses

Now, regarding the other drainage components that can also get affected, here’s what to do to troubleshoot them also.

Take out the bottom basket of your bosch dishwasher to get access to the drain filter.

We have a very informative article that will work you through that. 

After removing the drain filter, you need to clean and wash it with running water and soap.

Just ensure all the debris and clogs are gone. Regarding the drain impeller, check if it’s not damaged and you need to make sure it can move freely.

For the drain hose, disconnect it from the dishwasher at both ends and ensure it’s not kinked or filled with blockages.

#2. Clogged air gap

Bosch dishwasher water not draining

An air gap is a cylindrical fitting that connects your kitchen sink drain to your dishwasher. 

It prevents backflow of dirty water from cross-contaminating your dishwasher.

When the air gap is clogged with food debris or waste, it could be a reason why your dishwasher is not draining properly.

Below are some other related components to the air gap.

  1. Obstructed garbage disposal – If your bosch dishwasher is connected to a garbage disposal, it’s likely that the knockout plug has been left in the disposer’s drain tube. Also, there could be some sort of debris obstructing the garbage disposal.
  1. Clogged check valve – This is very similar to an air gap function, it helps prevent water from returning to the dishwasher once it’s been pumped out. Note that the appliance won’t drain properly if the check valve is stuck in a fixed position.
  1. Stuck check balls – In some bosch dishwasher models, check balls are used to prevent water from flowing back into the dishwasher tub. If it gets stuck, drainage issues might arise.

How to fix?

Clean the air gap

In order to fix the issue of your air gap and get your dishwasher to drain again, you need to clean the air gap.

Remove the air gap cap and clear any debris you see inside. Actually you can use the water from your sink to flush it out.

Then screw the cap back and make sure the drain hose that runs from the air gap to the garbage disposal isn’t clogged.

Remove the knock-out plug

Check if your dishwasher is connected to a garbage disposal. It should likely have knock-out plug which is expected to be removed earlier on while installing.

If you forgot to remove this, your dishwasher obviously won’t drain. 

All you need to do is to remove the knock-out plug in the nipple of the disposal in order for the dishwasher to drain. 

Otherwise try cleaning the drain tube of to clear out any blockage.

Clean the check valve and ball

Remember that drainage issues might only occur if the check valve is stuck in a fixed position. 

So you need to inspect and clean while ensuring that there’s nothing blocking or obstructing it.

What causes a bosch dishwasher not to drain

However, if the problem persists you should try replacing the components.

But before you do, check out other probable causes below.

#3. Malfunctioning Drain solenoid valve

Most bosch dishwashers usually have a drain solenoid valve. 

It’s responsible for opening the drain valve which allows water to drain out of the appliance.

If the solenoid fails to function properly, the valves will not open and this as a result leads to failure of the dishwasher to drain.

  • Pump and motor assembly – Additionally, if you found out that your drain pump isn’t clogged, electrically you should try testing the motor for continuity and replace the whole assembly.

How to fix?

You need to test the continuity of the solenoid with a multimeter. If it tests positive, there’s probably nothing wrong with the valve.

Why is my dishwasher not draining

But a negative result means you have to replace it.

Bosch silence plus 44 dba not draining?

If your bosch silence plus 44 dba dishwasher isn’t draining, this is most likely due to a clogged drain filter or issues with the drain hose.

Any potential blockage in this model of dishwasher is the reason why it’s failing to drain. 

What you have to do in this situation is to figure out areas or components that could have been affected by a blockage. Then you should be able to fix the problem afterwards.

Bosch dishwasher not draining but no blockage?

When you try all you can but it seems there’s no blockage in any component of the appliance. 

The issue is perhaps mainly due to a faulty wash impeller or malfunctioning control panel.

Inspect the highlighted components above in order to fix the issue.

Closing Remark

If your bosch dishwasher that won’t drain, dealing with it can be really frustrating, but it’s not the end of the world. By following the

With the troubleshooting steps I’ve outlined in this article, you can identify and solve many of the common reasons why your dishwasher may not be draining properly. 

Perhaps you’re still having issues with the dishwasher, don’t hesitate to call a professional for help. Thanks for reading.

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