How to Fix Bosch Dishwasher Error 15?

Wondering how to fix your Bosch Dishwasher error 15? Continue reading to know!

Bosch dishwashers are renowned for their user-friendliness as they display error codes to inform users of any problems with the machine.

One of the error codes that show when dishwashers have water flooding problems is error 15.

Let’s learn more!

The Bosch Dishwasher may display Error 15 for a number of reasons, such as using too much detergent, having a broken dishwasher fixture, or having a leaky sump basin.

Error 15 also appears when the hose is clogged, the filters are dirty, or due to a faulty control panel.

Let’s learn how you can easily fix your Bosch dishwasher’s error code 15:

How To Fix Bosch Dishwasher Error Code 15?

If your Bosch Dishwasher is giving you error 15 then it indicates that the drainage system is malfunctioning and that the dishwasher is overloaded with water.

Fortunately, if you use all of the troubleshooting techniques described below, the issue may be quickly fixed.

Try This First!

Without a doubt, a lot of water in the dishwasher causes the Bosch error 15, but it might also occur because of a fault with the control panel.

It’s possible that your dishwasher’s control panel has a glitch and erroneously displayed an error. A quick fix is a Hard-Reset process.

• Unplug the Bosch Dishwasher from the power outlet for 3 minutes!

In case error 15 is still there after the hard reset, proceed with the solutions!

Solution #1 Tilt Your Dishwasher

If your Bosch Dishwasher is still giving you error 15, it’s possible that the water has overloaded inside and isn’t draining.

Let’s attempt to manually drain the water from your dishwasher by tilting it first, then we’ll go on to checking the components.

Here is how you can tilt your Bosch dishwasher:

1. Switch off your dishwasher power and water supply.
2. Pull out your dishwasher from the wall or cabinet.
3. Tilt your unit to a 45-degree angle.
4. Place something hard underneath for support.

You will see that error 15 goes out and your dishwasher smoothly starts draining from the safety switch.

This doesn’t mean that the issue won’t happen again during the next cleaning cycle so make sure to proceed with the other solutions as well.

Note: Undo the tilt on your dishwasher before proceeding!

Solution #2 Remove Detergent Excess

There is a chance that you used more dishwashing detergent than necessary, which spilled into the lower base and caused error 15.

Running an empty wash cycle in the dishwasher is the only method to reduce the amount of detergent needed.

This allows all of the detergent or suds from the dishwasher’s parts to be drained away.

Pro Tip: Check your dishwasher soap container to determine how much detergent to use.

Here is how you can remove the detergent from the dishwasher:

1. Unplug the dishwasher from the outlet.
2. Remove all the utensils from the dishwasher.
3. Close the door and start an Empty Wash Cycle.
4. While the cycle running, you will see that the error will go out.

If you are sure that the detergent is not left in the dishwasher but still having the error, then move on to the following solutions!

Solution #3 Clean Dishwasher Filter

A clogged dishwasher filter typically also causes error 15 code because when it becomes blocked, it can prevent water from draining and cause flooding.

All you need is to clean your dishwasher’s filter and test performing a cleaning cycle after.

Here is how you can clean the dishwasher’s filter:

1. Open your dishwasher door and carefully remove all racks.
2. Then, take out the Spray Arms by pulling them up.
3. Next, take out the filter by rotating it counterclockwise.
4. Also, pull up a Square Mesh Panel from the dishwasher basin.
5. Clean the filter and mesh panel with soapy water.
6. Next, properly clean the filter from debris by using an old toothbrush.
7. Put the filter back in place first and then the mesh panel.
8. Lastly, close the door and run a wash cycle and check for the error.

Tip: Make sure to clean your dishwasher filter at least twice a week!

Solution #4 Inspect Sump Basin

The Sump Basin of your dishwasher may be leaking or malfunctioning, which would be why it is overloading your machine with water.

If you have tried all of the aforementioned solutions but bosch dishwasher error 15 is still there, inspect the sump basin.

The Sump Basin can only be tightened or replaced.

Here is how you can inspect your dishwasher’s sump basin:

1. Turn off the dishwasher power and water connection.
2. Pull out your dishwasher from the cabinet and place it in an open area.
3. Unscrew all of your dishwasher’s door outside screws and place the door aside.
4. Next, remove all the racks, spray arms, and filter from inside the dishwasher.
5. Also, pull off the dishwasher’s side panels and insulation plate.
6. Then, unscrew the dishwasher door underneath the panel screws.
7. Remove the plate to access the sumo basin.
8. Next, unscrew the door’s springs and remove the Heat Pump.
9. You can then easily access the Sump Basin and also Flood Sensor.
10. Replace those components and assemble back your dishwasher properly.

Note: If you are unable to inspect your dishwasher sump, then ask some professional for help!

Solution #5 Unclog Dishwasher Hose

All of the water that has to be discharged from the dishwasher can also flow through the hose, but if the hose is completely blocked, it will obviously result in error 15.

Simply unclog the hose properly or replace the component if it’s damaged.

Here is how you can unclog the dishwasher hose:

1. Turn off the dishwasher power and water supply.
2. Separate the dishwasher’s Lower Access Panel by unscrewing it.
3. Next, unscrew the screws of the outdoor panel from the door inside.
4. Separate down the Outdoor Panel and set it aside.
5. Remove the Brass Elbow from the Inlet Valve and disconnect the wiring harness.
6. Next, disconnect the Clamp using a Plier and then remove the Valve.
7. Unclogged the Hose by passing the water pressure.
8. Or replace the hose if the previous one is fully clogged or leaked.
9. Connect back the components as you separate.
10. Run a wash cycle to check whether now the error is fixed.

Solution #6 Replace Broken Fixtures

Without a doubt, the dishwasher’s fixtures contribute to the water’s smooth flow throughout the appliance, but with time, they started to corrode and begin to leak water.

The dishwasher has a lot of fixtures, therefore you should check each one individually.

The only solution is to replace the parts which have broken or corroded fixtures!

Here is how you can replace your dishwasher’s fixtures:

• Turn off the water and power supply.
• Take your dishwasher manual and look at your dishwasher’s fixtures places.
• Securely start unscrewing your dishwasher door and access the parts of the fixture.
• Replace the most corroded or broken fixture parts.
• Lastly, re-install all the components.

Tip: You can also access your dishwasher manual from Bosch's official website!

Solution #7 Inspect Water Supply Components

If, after attempting the aforementioned fixes, the error code 15 persists it’s possible that one or more water supply components may be leaking.

All you have to do is inspect the components and replace the defective ones.

Here are some of the dishwasher parts that you need to be checked:

• Dishwasher Tank
• Water Sprinkler
• Water Valves or Hoses

You can access these components via your manual, and you should check. If you are unable to accomplish this at home, please seek professional assistance.

In case you’re wondering where to find replacement water components for Bosch Dishwasher, check on the bottom of the guide!

Quick Recap:

Whenever your Bosch Dishwasher shows an error 15 on the panel, you first need to Hard Reset the machine and run an Empty Wash Cycle. In case the error persists, then clean the dishwasher filter, and hose, and replace a leaking sump basin.

Final Thoughts:

In this guide, we have thoroughly discussed the Bosch Dishwasher Error 15 and how to solve the problem as soon as possible.

What we’ve learned is that we need to make a thorough inspection of all water-drainage components and replace any of them with a proven fault.