Solved problem: Red key light - locked Constructa schott ceran. Posting a solution after HOURS of fighting this problem - I used this site extensively but couldn't find the answer in here, so hoping this helps someone else. holding for 5 seconds the button which extends the hob on the back right solved this for us (it's the button which looks like a circle superimposed on a rectangle-like shape, not the one of two concentric circles). This fixed the problem for a Constructa Schott ceran displaying the red key of doom and despair. The only model number on the ceramic surface was 9000285495. Happy cooking.

There are only two things you can do as induction cooktops for home use are new technology and also very unreliable, although Schott Ceran are the best of them.

Try doing a power reset, shut off the breaker for an hour or so.

Or

Call for service / check the warranty on it.

FAQ and a Contact Form.

https://www.schott-ceran.com/en/service?selected=2d4ae8e0f2634657a1cdf9c579bf75e5

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Question edited for clarity.
Question moved to Schott Ceran category.

Replacement knobs, but it should go by the numerical model number in the search query as well.

https://www.google.com/search?q=schott+ceran+cooktop+replacement+knobs

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make model specs will get you somewhere like here

https://www.bosch-home.ca/en/productlist/cooking-baking/cooktops/electric-cooktops?pageNumber=1

Schott Cerans is the maker of the glass not the model number.

https://www.us.schott.com/ceran/english/index.html?wss_setorigin=1&wss_iso=en-US

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Possible failed part that needs to be replaced according to the discussion below:

https://www.justanswer.com/uk-appliance/b1ztt-schott-ceran-hob-not-working-showing-er26-just.html


My schott ceran hob is not working and showing er26 Just

Contact Schott

https://www.schott.com/ceran/english/index.html

SCHOTT CERAN the Original Cooktop Glass since 1971

https://www.schott.com/ceran/english/contact/index.html

On mine it meant that one of the electric elements has burned out. Try the burners and see if they all work. If not, the element is bad.

I navigated the SCHOTT website to find a solution and was able to find out how to properly clean my SCHOTT stove top. I would check the Ceran FAQ list to see if your question is answered before anything else.

magnetic gradeI have a SCHOTT Ceran glass ceramic cooktop as well, and soon realized that induction cooktops like this require that your metal cookware be in contact with the surface for them to heat up. Best cookware:

• Cast iron pans
• Any black metal pans
  
• Stainless steel pans, if base is magnetic grade (magnet sticks to bottom)

Read more: http://www.us.schott.com/hometech/english/products/ceran/dailyuse/index.html

Hi,

If you have an illuminated red key symbol on the cooktop, press down where the illuminated red key is, for about 5 seconds. This method works on many Schott Ceran / Miele cooktops including the KM443 listed above.

If this doesn't work, please let me know the correct model number.

Hope this helps.

Regards,
BElectric

I want to say that since I posted my original problem with black spots appearing on the Schott Ceran top, I took pictures of the top and attached them to a complaint sent to Maytag. Approximately 3 days later, a Maytag representative phoned and offered a brand new top-basically stating that there is a fault with the tops. They would not pay for the labor to replace the top. My husband downloaded the instructions from Maytag website and installed it himself. These spots actually appear from within the surface and are not the result of a boil over, etc. The spots on my burner grew to the width of the burner. If you search the internet, you will see many others with the same problem with the Schott Ceran tops. I will never buy another!