Viking oven shows F05 and may shut down during a self-clean cycle or high-temperature bake.

Safety first: Turn off power at the breaker and allow the oven to cool completely before accessing internal components.

Steps to check and correct:

• Listen for fan operation: During a bake or self-clean cycle, you should hear the cooling fan running behind the control panel. If it is silent, proceed with inspection.
• Access the fan: Remove the rear panel of the range or the top panel (depending on model) to access the cooling fan assembly.
• Inspect for obstructions: Check that the fan blades spin freely by hand. Remove any insulation, wiring, or debris that may be blocking the blades.
• Test the fan motor: With a multimeter, check for continuity across the fan motor terminals. An open circuit indicates a failed motor. Also verify that the fan receives proper voltage when the oven is calling for cooling (this test should be done carefully with power on; if unsure, call a technician).
• Check fan thermostat/relay: Some Viking models use a thermostat or relay to switch the fan on. Inspect the thermostat for continuity when hot and the relay for signs of burning or arcing. Replace if defective.

When to call a technician: If the fan motor needs replacement or if live-voltage testing is required, professional service is recommended.