Viking oven shows F12 and will not start; may occur after a power outage or surge.

Safety first: Turn off power at the breaker before attempting any control reset.

Steps to check and correct:

• Power cycle: Turn the breaker off for 5–10 minutes, then back on to see if the control reinitializes.
• Enter configuration mode: Some Viking controls allow entering a service or configuration mode via a key sequence (refer to the service manual). Verify that the correct model option code is set.
• Check for recent repairs: If a control board was recently replaced, confirm that the correct part number was installed and that it was properly programmed for your range model.
• Replace or reprogram control: If configuration cannot be restored or F12 persists, the control board may need to be reprogrammed or replaced.

When to call a technician: Configuration and programming typically require service documentation and sometimes special tools; contact an authorized Viking service provider.