ERR 03 on a Wolf Legacy Dual Fuel Range: Open Circuit on the RTD Oven Sensor

What 03 means

On Wolf legacy dual fuel ranges like the DF304 and DF364C, ERR 03 means the control detected an open circuit on the RTD, the oven temperature sensor. With no sensor reading, the oven cannot regulate heat, and the cooling fans may run non-stop. The display shows ERR 03 and baking will not be reliable until the sensor circuit reads normally.

Common causes of 03

RTD oven sensor open or broken
Loose or damaged sensor wiring connection
Control board not reading the sensor input

✓ One safe check you can try

1. Turn the oven OFF and let it cool fully. 2. Cut power at the range breaker for a minute, then restore it. 3. Start a short bake and watch whether ERR 03 returns. 4. Do not keep running the oven if the fans stay on after it is off. 5. Call us if the code comes back.

! Why to stop there

Reaching the sensor and its wiring means working inside the oven wall and behind panels.
Cooking without a working sensor can overheat food and the cavity.
Our quote comes first on paper, and a 30-day workmanship warranty follows the repair.

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 Range codes

0021Wolf Dual Fuel DFxx50 Code 0021: Bake element drive shorted, right oven 20Wolf Legacy Induction Range Code 20: Input Voltage Over 300 Volts 0022Wolf Dual Fuel DFxx50 Code 0022: Left oven bake element drive shorted E01Wolf IR30450 and IR36550 Induction Range Code E01: Left Key Error 0121Wolf Dual Fuel DFxx50 Code 0121: Right convection drive shorted in the right oven ErrWolf Legacy Dual Fuel Range Code Err: How the Error Display Works 0122Wolf Dual Fuel DFxx50 Code 0122: Right convection drive shorted in the left oven Ignition LockoutWolf Gas Burner Code Ignition Lockout: Slow-Blinking Call-for-Heat Light

0303 questions

Why are my fans running all the time?

With an open sensor circuit the control cannot read temperature, so it keeps the cooling fans on. That is part of the ERR 03 response rather than a separate problem.

Can I bake with ERR 03 showing?

We advise against it. Without a temperature reading the oven cannot hold heat accurately, and results and safety are both at risk. A baked-on result that comes out uneven or undercooked while this code shows is a good reason to hold off.

Is the sensor expensive to replace?

We quote the exact price in writing before starting, so you decide with the number in hand. Call us with the model and we will explain the options.