Wolf Oven Error Code F18: How to Fix It

Q: What does the F18 error code mean on a Wolf oven?

The F18 error code on a Wolf oven means that the secondary oven temperature sensor (Sensor 2) has detected a fault. This could be a broken sensor probe, an open or shorted circuit in the sensor wiring, or a failed connection between the sensor and the control board. The oven uses this sensor to verify cavity temperature, and when it reads out of range or receives no signal, it triggers F18 and may stop operating to prevent unsafe temperatures.

Q: Can I still use my Wolf oven while it shows error code F18?

It is not recommended. When F18 is active, the oven cannot reliably monitor its internal temperature, which means it could overheat or fail to reach the correct cooking temperature without warning. Most Wolf ovens will lock out heating functions when this fault is active as a safety measure. You should resolve the error before using the oven again.

Q: How much does it cost to fix a Wolf oven F18 error?

If the fix is a DIY sensor replacement, expect to pay roughly $20–$80 for a compatible oven temperature sensor probe, depending on your Wolf model. If a professional repair is needed, labor typically runs $100–$200 per hour for appliance technicians, and a full sensor replacement service call usually costs $150–$350 total. Control board replacement can cost significantly more — $300–$700 or higher including the part and labor.

Q: How do I find the correct replacement sensor for my Wolf oven model?

Open the oven door and look for the model and serial number label, which is usually affixed to the left side of the door frame or the front frame of the oven cavity. Use that model number to search for a compatible oven temperature sensor probe. You can search the full model number on Wolf's official parts portal, a reputable appliance parts retailer, or Amazon. Make sure the replacement part specifies compatibility with your exact Wolf model series.

Q: Why does my Wolf oven keep showing F18 even after I replaced the sensor?

If F18 returns after a sensor replacement, the most likely causes are: (1) a damaged wiring harness between the sensor and control board that was not repaired, (2) the replacement sensor is not the correct type or resistance rating for your model, or (3) the oven's main control board has a failed Sensor 2 input circuit and needs to be replaced. Use a multimeter to verify the new sensor reads approximately 1,000–1,100 ohms at room temperature, and test the full harness for continuity before concluding the board is at fault.

Abstract

The Wolf oven error code F18 indicates a fault with the secondary oven temperature sensor (Sensor 2), which monitors oven cavity heat to ensure accurate cooking temperatures. This sensor either has a broken circuit, a short, or has failed completely, causing the oven to lose confidence in its temperature readings. While this is a medium-severity issue, the oven may shut down or refuse to operate to prevent overheating or undercooking — but in many cases a DIY repair is possible with basic tools.