Wolf Legacy Induction Range Code 20: Input Voltage Over 300 Volts

What 20 means

On Wolf legacy induction ranges built before 2018, such as the IR304TE/S/TH and IR365PE/S/PH, code 20 means a wrong connection: the control measured an input voltage above 300 volts. The cooktop shuts down to protect itself and shows the code. Do not confuse it with the 2018 IR30450 and IR36550 cooktops, where E20 refers to a temperature sensor condition instead.

Common causes of 20

Range wired to the wrong supply voltage
Supply connection at the terminal block incorrect
Utility or house wiring delivering excess voltage

✓ One safe check you can try

1. Turn all zones off and switch the range breaker off. 2. Do not keep restoring power to see if the code clears. 3. Note whether this started after a move, a new install, or electrical work. 4. Leave the wiring alone. 5. Call us so the supply can be checked by a trained technician.

! Why to stop there

Overvoltage can damage the induction electronics, so repeated power-up attempts are risky.
Checking supply voltage needs live testing that owners should not attempt.

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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2020 questions

Does code 20 mean the cooktop failed?

Not necessarily. It says the incoming voltage is wrong, over 300 volts. That points to the connection or supply first, which we verify. The control sensed a connection that does not match the cooktop rating and stopped, which is a protective response.

Is E20 on my newer induction range the same?

No. On IR30450 and IR36550 models, E20 relates to a temperature sensor condition. The two codes differ by platform, so tell us your full model number.

Can I reset the breaker to clear it?

We advise against repeated resets. If the voltage really is too high, power-up risks damage. Call us for a safe check. We would rather inspect the supply once than let the induction electronics take repeated high-voltage starts.