Oven display shows E04 and the unit will not start a cooking cycle.

Safety: Disconnect power at the breaker before removing the control panel or touching internal wiring.

• Power cycle: Turn off power for 5 minutes, then restore. If E04 clears temporarily but returns when keys are pressed, suspect the touch panel.
• Access control panel: Remove the trim and mounting screws securing the control panel. Carefully pull the panel forward to expose the ribbon cable and connectors.
• Inspect ribbon cable: Check for kinks, cracks, or corrosion on the ribbon contacts. Reseat the ribbon cable at both the touch panel and main control board, ensuring it is fully inserted and locked.
• Check for moisture: Look for signs of condensation or liquid spills behind the glass. If moisture is present, allow the panel to dry completely (24 hours with power off) and then test again.
• Replace faulty component: If reseating does not resolve the error, replace the touch control panel assembly. If a new panel does not fix the issue, the main control board is likely defective and should be replaced.
• Professional help: Because the glass touch assembly is fragile and expensive, many homeowners prefer a factory-authorized Sub-Zero technician for this repair.