Wolf CSO Steam Oven Code E27 / F17: cracked or overheated humidity sensor

What E27 / F17 means

On Wolf CSO convection steam ovens such as the CSO24 and CSO30 series, E27 with F17 means a hairline crack in the climate sensor, or that the sensor's temperature limit of 300 degrees Celsius was exceeded. The official note adds that very warm air flowing over the sensor during self-clean, from a bad door gasket, can cause it. The oven stops and shows the pair.

Common causes of E27 / F17

Hairline crack in the climate sensor
Temperature limit of the sensor, 300 degrees Celsius, exceeded
Excessively warm air passing over the sensor during self-clean because of a bad door gasket

✓ One safe check you can try

1. Turn the oven off and let it cool for at least an hour. 2. Inspect the door gasket for gaps, flattening, or tears without pulling on it. 3. Do not run a self-clean cycle again. 4. Call for service if E27 / F17 returns.

! Why to stop there

An overheated or cracked sensor can give wrong readings and risks further overheating.
Gasket and sensor both need testing before deciding what to replace.
You see a written price first, and our repair has a 30-day 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.

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Other Steam Oven codes

U2Wolf CSO Steam Oven Code U2: mains undervoltage Boiler scaled upWolf Convection Steam Oven Message Boiler scaled up: Descale required E26Wolf Convection Steam Oven Code E26: Climate sensor problem E87Wolf 24-Inch E Series Code E87: Exhaust slide valve jammed or shorted E42Wolf Convection Steam Oven Code E42: Water temperature sensor error E26Wolf 24-inch E Series Code E26: Break or loose contact in climate sensor, or blocked duct E87Wolf Convection Steam Oven Code E87: Exhaust slide valve stuck F6Wolf Convection Steam Oven Code F6: Processor and Main Relay Error E51

E27 / F17E27 / F17 questions

Why does the door gasket matter?

A worn gasket lets very hot air reach the climate sensor during self-clean. That heat is one of the listed reasons the sensor limit is exceeded.

Can I use the oven after E27 / F17?

We suggest waiting until it is inspected. The sensor may be cracked, and a damaged sensor can mislead the oven about temperature.

Should I avoid self-clean?

Yes, until the gasket and sensor are checked. Running another cycle with a bad gasket can repeat the overheating.