Wolf Induction Cooktop Code E40: Generator Burner Sensor Shorted

What E40 means

Earlier Wolf CT induction cooktops, including the CT30 and CT36 sizes, use E40, E41 and E42 for a generator burner sensor that reads shorted. The affected burner is shut down by the control and will not heat until the cause is repaired. E40 shows up on screen while the rest of the cooktop may behave. Be careful with the number: on CI and IR ranges, E40 means a generator hardware error involving the relay or synchronization instead.

Common causes of E40

Burner sensor circuit reading shorted
Generator input for the burner sensor failing
Burner sensor wiring damaged

✓ One safe check you can try

1. Switch off every burner and let the glass cool. 2. Turn the breaker off for a minute, then restore power. 3. Try the burner that shut down once. 4. If E40 comes back, leave it off and do not open the cooktop. 5. Call us with the model number and the code.

! Why to stop there

The same code means something else on other Wolf cooktops, so the model must be matched first.
A shorted sensor reading needs meter tests that owners should not attempt.
We quote in writing first and give a 30-day workmanship warranty.

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.

→Same appliance

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 E3Wolf Induction Code E3: Generator 2 Heat Sink Overtemp E30Wolf CT Induction Code E30: burner ON LED failure, LED board E33Wolf CT Cooktop Code E33: LED Board Failure on a Burner 39Wolf 2015-Series Cooktop Code 39 Flags a Controller Options Error E4Wolf CT Induction E4 Code: Heat Sink of Generator 3 Overheated

E40E40 questions

Is E40 the same on my Wolf range?

Not always. On CI and IR ranges E40 is a generator hardware error. On these earlier CT induction cooktops it is a shorted burner sensor.

What do E40, E41 and E42 share?

They all describe a shorted generator burner sensor. The number tells us which burner's sensor read as shorted. The cost of the visit is quoted in writing before we start.

Can I use the other burners?

Possibly, because only the affected burner is shut off. We would still like to check it soon. Please do not remove covers, since that exposes live parts and may void other protections.