Magic Chef oven displays F12, often indicating a communication problem between display and power boards.

Safety first: Turn off power at the breaker before accessing internal controls.

• Inspect harness connections: Remove the control panel and locate the harness linking the display module to the main control. Reseat all connectors firmly.
• Check for corrosion or heat damage: Look for discolored connectors or burnt traces on either board.
• Power reset: After reseating connectors, restore power and test. If F12 returns, one of the boards is likely faulty.
• Replace suspect board: Start with the display/control interface board if separate. If the problem persists, replace the electronic oven control (EOC) board.

When to call a technician: If you are unsure which board is defective, a technician can perform board-level diagnostics.