Wolf Convection Steam Oven Code E87: Exhaust slide valve stuck

What E87 means

On Wolf convection steam ovens, such as the CSO24TE/S/TH or CSO30TM/S/TH, E87 means the exhaust slide valve is stuck with grease deposits, or the motor or valve is jammed, or there is a short circuit in the slide motor or its wiring. Knob-control models show it as F4. Steam or heating may stop, and you may hear a motor trying to move.

Common causes of E87

Exhaust slide valve stuck with grease deposits
Motor or slide valve jammed
Short circuit in the slide motor or its wiring

✓ One safe check you can try

1. Turn the oven off and let it cool fully. 2. Wipe visible grease around the exhaust opening, keeping cloth away from deep inside. 3. Give the oven a fresh start by cycling its breaker. 4. Try a short cycle. When E87 or F4 keeps coming back, stop and call us. Do not force the valve.

! Why to stop there

The slide valve is inside the housing near the exhaust, where grease and moving parts are hard to reach safely.
A stuck valve and a failing motor need different repairs.
We quote the work in writing before starting.
A 30-day workmanship warranty is included.

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

E26Wolf 24-inch E Series Code E26: Break or loose contact in climate sensor, or blocked duct F0Wolf Convection Steam Oven Code F0: Core temperature probe sensor problem F6Wolf Convection Steam Oven Code F6: Processor and Main Relay Error E51 F1Wolf Convection Steam Oven Code F1: Food probe error F15Wolf CSO Steam Oven Code F15: niche running too hot F10Wolf Convection Steam Oven Code F10: Control moisture or water tank valve F17Wolf CSO Steam Oven Code F17: climate sensor overtemperature F13Wolf Convection Steam Oven Code F13: Cabinet opening too hot

E87E87 questions

Is F4 the same as E87?

Yes. F4 is the knob-control display for the same exhaust slide valve problem. It is the valve moving the steam out of the cooking space, so grease buildup can keep it from sliding.

Can grease alone cause it?

Yes. Grease deposits can make the slide stick. Cleaning the valve properly takes access inside the oven, so we handle it. Tell us if you hear a motor.

Will it stop steam cooking?

The oven may limit steam or stop until the valve moves freely. It stays limited until the slide is free and the motor moves it.