Control panel is completely dead; no display, no lights, oven does not respond.

Safety first: Verify power is off before opening any panels. Mains voltage is lethal.

Step-by-step checks:

• Check breaker: Verify that the oven's circuit breaker is not tripped. Reset if necessary.
• Verify outlet/junction: For plug-in models, test the outlet with another appliance. For hardwired units, have a qualified person test voltage at the junction box.
• Inspect terminal block: Remove the rear cover and check the power terminal block for burnt connections or loose screws.
• Internal fuse: Some Haier ovens have an internal line fuse on or near the control board. Test and replace with the exact type and rating if blown.

When to replace parts: Repair or replace a burnt terminal block or wiring. If power is present at the board but the control is dead, replace the electronic oven control board.