Wolf CSO Steam Oven Code F8: Stuck relays

What F8 means

F8 on Wolf CSO convection steam ovens, such as the CSO24 and CSO30 series, is the display label for E43 and E45 through E48. The official meaning is a stuck relay: the neutral relay (K1 or K2) for E43, or one of the actuator relays K3 to K6 for E45 to E48. Owners see F8 and the oven shuts down. A stuck relay is a safety matter, so the oven should stay off.

Common causes of F8

Neutral relay K1 or K2 stuck
Actuator relay K3, K4, K5 or K6 stuck

✓ One safe check you can try

1. Turn the oven's breaker off. 2. Do not run the oven. 3. Restore power once after a minute to see if the code clears. 4. If F8 returns, leave the breaker off and call us. Do not open the casing or touch any relay.

! Why to stop there

A stuck relay can keep a part powered when it should not be.
Relays sit on the relay board inside the unit.
Only testing shows which relay is stuck.

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

U1Wolf CSO Steam Oven Code U1: L2 supply problem 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

F8F8 questions

What does a stuck relay mean?

A relay that should switch off stays closed. The oven detects this and shows F8, to protect itself and you. On site we look at neutral relay K1 or K2 stuck and actuator relay K3, K4, K5 or K6 stuck, then quote the repair in writing.

Which relays does F8 cover?

The neutral relay K1 or K2, and actuator relays K3 to K6, under codes E43 and E45 to E48. Starting point for us is usually neutral relay K1 or K2 stuck, with the price written down before any work.

Is the oven safe to leave plugged in?

We suggest switching the breaker off until we arrive. We confirm the relay, give a written price, and repair it with a 30-day warranty. We would also rule out actuator relay K3, K4, K5 or K6 stuck before recommending anything.