E12 Dishwasher Error Code

Your dishwasher has a self-diagnosis system that helps you know and understand when you need to regular maintenance or fix an issue. Through error codes, you will be able to determine the issue with your machine and schedule help if needed to fix them appropriately.

My Thermador Dishwasher is displaying an error code E12, what does it mean?

An E12 error code indicates a build up of limescale in the heat pump. Use a descaler to remove hard water deposits and limescale buildup.

Why do I need to descale my dishwasher?

Dishwashers are used on a regular basis which means that limescale can build up quickly, especially in hard water areas. To keep your dishwasher working as efficiently and effectively as possible, and to ensure your dishes come out perfectly clean, regular descaling is important.

How can I prevent the the E12 error code in my dishwasher going forward?

To help avoid this issue in future instances, use softening salt in your dishwasher if it comes with a water softener. Also, use softening salt in your dishwasher if it utilizes it. Review your owner's manual to learn more. It can be downloaded here if you don't have a copy. To learn more, view our 'How to Add Salt' video on our How-to Video page. Purchase softener salt in our accessories store.

Please contact Thermador Customer Service at 1-800-735-4328 if you need further assistance.