Wolf Legacy Dual Fuel Range ERR 04 Code: Shorted RTD Sensor Circuit

What 04 means

A Wolf legacy dual fuel range, for example the DF366 or DF606CG, shows ERR 04 when the control detects a shorted circuit on the RTD temperature sensor. This is the opposite of an open circuit: the control reads the sensor as shorted, so it cannot trust any oven temperature. Expect the code on the display and unreliable or stopped heating.

Common causes of 04

RTD oven sensor shorted internally
Sensor wiring touching metal or damaged
Control input reading the sensor incorrectly

✓ One safe check you can try

1. Turn the oven OFF and let it cool. 2. Look inside only after it is cool, and do not touch or bend the sensor. 3. Let the range sit without power for a minute at the breaker, then switch it on. 4. Try a short bake. 5. If ERR 04 appears again, call us instead of retrying.

! Why to stop there

A shorted sensor line may mean damaged wiring that is not visible from the front.
Guessing at parts costs more than one accurate diagnosis.
We put the cost in writing up front and warrant the workmanship 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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0404 questions

How is ERR 04 different from ERR 03?

Both involve the RTD sensor. ERR 03 means an open circuit, while ERR 04 means a shorted one. The sensor is the common point, but the cause behind it may differ.

Can I touch the sensor to check it?

Please do not. It sits inside a hot oven, and handling or bending it can make a reading problem worse. Leave it for a technician.

Will the oven still heat?

It may not, or it may behave unevenly, because the control has no trusted temperature. We recommend pausing use until we inspect it. Please note that heat may also be uneven, so avoid cooking anything that depends on exact temperature.