Bosch Dishwasher Error code E19, E20, E21

Bosch dishwashers are well-regarded for their efficiency and performance, but from time to time, they may encounter issues that are communicated through error codes. If you’ve come across error codes E19, E20, or E21 on your Bosch dishwasher, it’s a sign of a heating problem. In this article, we’ll take a closer look at these error codes, understand the heating issues they represent, and explore the steps to resolve them.

Error Code E19, E20, E21 – What Does It Mean?

• E19: This error code suggests a problem with the heat exchanger.
• E20, E21: These error codes point to issues with the heat pump.

Common Symptoms:

• Longer than usual wash cycles.
• Dishes not coming out clean.
• Dishes not drying properly.

Causes of Heating Issues (E19, E20, E21):

1. Faulty Heat Exchanger (E19): The heat exchanger is responsible for heating the water in the dishwasher. A fault in this component can disrupt the heating process, resulting in poor wash and dry performance.
2. Heat Pump Problems (E20, E21): The heat pump plays a vital role in maintaining the water temperature. Issues with the heat pump can lead to insufficient heating, which affects the dishwasher’s overall performance.

Steps to Address the Issue:

1. Check for Debris:

Begin by turning off the dishwasher and inspecting the heat exchanger and heat pump. Remove any debris or foreign objects that may be obstructing these components.

2. Examine the Heating Element:

Ensure that the heating element is free from corrosion or damage. A damaged heating element can affect the dishwasher’s ability to heat water.

3. Reset the Dishwasher:

In some cases, a simple reset may resolve the issue. Turn off the dishwasher, unplug it, wait for a few minutes, and then plug it back in.

4. Test the Water Supply:

Verify that the dishwasher has a proper and consistent water supply. Inadequate water flow can lead to heating problems.

5. Consult the User Manual:

Check the user manual for specific instructions related to error codes and heating issues. It may offer guidance on resetting the dishwasher or other troubleshooting steps.

6. Seek Professional Help:

If the problem persists or if you’re uncomfortable with diagnosing and repairing the issue yourself, it’s advisable to contact a professional appliance repair technician. They have the expertise to identify and fix more complex heating problems.