Wolf dual-fuel range convection fan does not run and display shows E20 when convection mode is selected.

Safety first: Disconnect power at the breaker and allow the oven to cool.

• Access convection fan: Remove oven racks and the rear interior panel to expose the convection fan.
• Check for obstructions: Ensure nothing is blocking the fan blades. Remove any debris and verify the fan spins freely by hand.
• Test motor: With power off, disconnect the fan motor leads and measure resistance. An open circuit indicates a failed motor that must be replaced.
• Inspect wiring and limiter: Trace the wiring from the fan to the control board, checking for a thermal limiter or thermostat in series. Test for continuity and replace if open.
• Control board: If the motor and wiring are good, the convection relay on the control board may be defective and require board replacement.