Bosch Washer Error Code Er:21

The primary cause of Er:21 is an overuse of detergent, particularly regular or non-HE (High-Efficiency) detergent. Bosch front-load washers are designed to use HE detergent, which is specially formulated for low water levels in these machines. When too much regular detergent is used, it can create excess suds and foam, triggering the error code.

The Solution:

To address the Er:21 error code and prevent it from recurring, follow these steps:

1. Choose High-Efficiency (HE) Detergent:

Make sure you are using a detergent labeled as High-Efficiency (HE). These detergents are designed to produce fewer suds in front-load washers. They are widely available at most stores.

2. Measure the Detergent Properly:

Use the recommended amount of HE detergent, which is typically significantly less than regular detergent. Most loads only require about 1 tablespoon of HE detergent due to the reduced water level in front-load washers.

3. Reduce the Detergent for Future Loads:

It’s essential to adjust your detergent usage for future loads. Be mindful of the detergent quantity you’re adding, and use a measuring cup to ensure accuracy.

4. Run Additional Rinses:

If you suspect there is excess detergent residue in your washer, consider running additional rinse cycles without adding any detergent. This can help remove any lingering suds.

5. Clean the Washer Drum:

Periodically clean the interior of your washer to remove any detergent buildup. Wipe down the drum and check for any residue that may contribute to excess suds.

By following these simple steps, you can effectively resolve the Bosch washer error code Er:21 and prevent it from occurring in the future. Remember that proper detergent usage is key to maintaining your Bosch front-load washer’s performance and ensuring that your laundry cycles run smoothly.