Wolf CSO Steam Oven Code F22: Boiler, tank motor or slide valve

What F22 means

F22 is a shared display label on Wolf CSO convection steam ovens such as the CSO24 and CSO30 series, covering E71, E75 and E77. The official causes include a scaled-up boiler, a leaking inlet valve, a water-tank drive motor problem, and an exhaust slide valve that is stuck. Owners see F22 and steam cooking stops. Check which E code your oven also reports, because that narrows the cause.

Common causes of F22

Scaled-up boiler or leaking inlet valve
Water tank drive motor problem
Exhaust slide valve stuck with grease

✓ One safe check you can try

1. Let the oven cool and wipe splatter from the cavity. 2. Empty and refill the tank with fresh water, seating it fully. 3. Switch off at the breaker for one minute and restore power. 4. Try a short steam cycle. 5. If F22 returns, call us. Do not open the casing.

! Why to stop there

Several parts can raise F22, and only testing shows which.
The motor and valve are inside the casing.
Guessing wastes time and money.

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.

→Same appliance

Other Steam Oven codes

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 F0Wolf Convection Steam Oven Code F0: Core temperature probe sensor problem F15Wolf CSO Steam Oven Code F15: niche running too hot F1Wolf Convection Steam Oven Code F1: Food probe error

F22F22 questions

Why does F22 cover three E codes?

The display shows one F label for several related conditions: E71, E75 and E77. We read the details to find the actual cause. On site we look at scaled-up boiler or leaking inlet valve and water tank drive motor problem, then quote the repair in writing.

Which one is likely for me?

If it appears during descaling, think boiler or foam. If you see grease buildup, the slide valve is a candidate. A technician tests to be sure. Starting point for us is usually scaled-up boiler or leaking inlet valve, with the price written down before any work.

What do you charge to diagnose?

We tell you the price in writing before any work, and the repair carries a 30-day workmanship warranty. We would also rule out water tank drive motor problem before recommending anything.