Oven displays E3 and will not start; often appears immediately on power-up.

Safety first: Disconnect power at the breaker before accessing the control board.

• Step 1 – Power reset: Turn the breaker OFF for 10–15 minutes to fully discharge the control. Restore power and check if E3 returns.
• Step 2 – Verify part number: If the control board was recently replaced, confirm that the installed board matches the exact Zline part number for your model and configuration.
• Step 3 – Inspect control board: Remove the control panel cover and inspect the board for visible damage, burnt components, or corrosion.
• Step 4 – Replace control board: If E3 persists after a reset and the board appears damaged or is known to be incorrect, replace the electronic oven control board. Some models may require configuration or programming; follow Zline service instructions.

Note: E3 errors are rarely caused by external wiring; they almost always indicate a control board issue.