Wolf Cooktop Code E09: Keyboard link, coil overheat, or ambient above 217F

What E09 means

On Wolf CT electric cooktops such as the CT30E/S, E09 is a keyboard communications error. On CI induction cooktops with the touchscreen, such as the CI30460T/S, it means a coil temperature that is too high. On integrated module cooktops from the 2015 series, such as the GM15TF/S, it means the ambient temperature passed its limit, 217F by default. The display shows E09, and the cooktop may shut off the affected heating.

Common causes of E09

Keyboard communication problem on a CT electric cooktop
Induction coil running too hot on a CI touchscreen cooktop, often tied to cooling or cookware
Ambient temperature past its limit on a module cooktop

✓ One safe check you can try

1. Remove cookware and let the glass cool completely. 2. Check that the area around the cooktop vent is clear and that nothing is stored too close. 3. Use flat-bottomed pans of the right size when you resume. 4. Shut the cooktop breaker off for a minute, then close it again. 5. If E09 returns, stop and call us.

! Why to stop there

Overheating and a keyboard problem point in different directions, so we confirm the platform first.
A coil that keeps overheating can damage parts, so repeated use is a poor test.
You approve a written estimate up front, and we stand behind the finished job for 30 days.

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

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Other Cooktop codes

E7Wolf Induction Cooktop Code E7: Keyboard Diode Configuration Error E8Wolf CT Induction Code E8: no communication with generator 1 E9Wolf CT Cooktop Code E9: Generator 2 Communication Error E19Wolf CT Induction Code E19: read line failure E2Wolf CT Cooktop Code E2: generator 1 heat sink above 194F E20Wolf CT Cooktop Code E20: Shorted Generator Burner Sensor E22Wolf Induction Code E22: open burner sensor on generator 1 E3Wolf Induction Code E3: Generator 2 Heat Sink Overtemp

E09E09 questions

Can the wrong pan cause E09 on induction?

Cookware that is warped, oversize, or left empty can raise coil heat. We start there, then check cooling and the control, since E09 means the coil temperature is too high.

What is 217F on a module cooktop?

It is the default ambient limit. When the temperature around the module passes that, E09 appears. Airflow and nearby heat are the first things we examine.

Will it return after cooling down?

Often the code clears once things cool, but if cooking brings it back again, something is limiting heat loss and needs a technician. We would rather diagnose it once than guess twice.