Thermador Oven Error Code E195: How to Fix It

Q: What does error code E195 mean on a Thermador oven?

Error code E195 on a Thermador oven means that the steam generator has detected excessive mineral scale buildup. This is caused by hard water deposits accumulating on the internal heating element and walls of the steam generator over time. The oven triggers this code to alert you that descaling is needed to maintain proper steam performance and protect the appliance.

Q: How often should I descale my Thermador steam oven?

Thermador generally recommends descaling your steam oven every 3 to 6 months, depending on how frequently you use the steam function and the hardness of your local water supply. If you live in an area with very hard water and use the steam function regularly, you may need to descale every 6 to 8 weeks. Using filtered or distilled water in the reservoir can significantly slow scale buildup and reduce how often descaling is needed.

Q: Can I use vinegar to descale a Thermador steam oven?

Yes, white distilled vinegar diluted 1:1 with water is a commonly used and effective descaling agent for Thermador steam ovens. However, many technicians prefer citric acid-based descaling solutions because they are odorless and less corrosive over the long term. Avoid using apple cider vinegar or flavored vinegars, as these can leave residue and odors inside the oven.

Q: Will the E195 error code clear itself after descaling?

In most cases, yes — the E195 error code will automatically clear once you successfully complete the built-in descale cycle on your Thermador oven. If the error does not clear after one descale cycle, run a second cycle. If it still persists after two cycles, the scale buildup may be severe enough to have damaged the steam generator sensor or heating element, and you should contact a Thermador-authorized service technician.

Q: Can I prevent Thermador E195 error code from coming back?

Yes. The best way to prevent E195 from recurring is to use filtered or distilled water in your steam oven's reservoir instead of tap water. Filtered water contains far fewer minerals, which dramatically reduces scale buildup. You should also make a habit of draining and drying the reservoir after every use, and stick to a regular descaling schedule every 3 to 6 months depending on your usage and water hardness.

Abstract

The Thermador oven error code E195 indicates that mineral scale has built up inside the steam generator, which is the component responsible for producing steam during steam-assisted cooking. Over time, hard water deposits accumulate on the heating element and interior walls of the steam generator, reducing its efficiency and triggering this alert. Descaling the steam generator is a routine maintenance task you can typically handle yourself without calling a technician.