Wolf Cooktop Code E19: Run time diagnostics failure or rear LO LED mismatch

What E19 means

On Wolf CT electric cooktops such as the CT36EU, E19 is a run time diagnostics failure, meaning one of the checks the control runs while cooking did not pass. On Wolf integrated module cooktops from the 2015 series, such as the SM15TF/S, E19 is a rear LO LED state error, where the rear low-setting light does not match the commanded state. The display shows E19.

Common causes of E19

Control self-check failing during cooking on a CT electric cooktop
Rear LO indicator on a module cooktop not matching the commanded state
Control board or indicator driver

✓ One safe check you can try

1. Switch every element off and wait for the surface to cool. 2. Power the cooktop down at its breaker for 60 seconds and restore it. 3. Start one element and watch whether the display and lights behave normally. 4. If E19 returns, stop and call us.

! Why to stop there

A self-check failure does not say which part is wrong, so testing is needed.
Control and indicator checks involve live circuits under the glass.
The quote comes before the tools do, and our workmanship is covered for 30 days afterward.

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

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E19E19 questions

What is a run time diagnostic?

It is a check the control repeats while cooking to confirm things work. On CT cooktops, E19 means one of those checks failed. We keep the visit focused on the code you are seeing.

Is the rear LO light the same as the front one?

They are separate. E18 refers to the front LO LED and E19 to the rear LO LED on the module cooktops, so we know which side to inspect.

Can I cook while E19 is shown?

We suggest not doing so. The control stopped because a check failed, and until we test it we cannot say what part is involved. The first visit is usually enough to name the cause.