Oven displays E1 and will not start; often associated with sensor or temperature reading issues.

Safety first: Turn off power at the breaker before accessing the rear or internal panels.

Step-by-step checks:

• Verify sensor type: Confirm that the installed sensor matches the original Haier part number for your model. Using a non-compatible sensor can trigger E1.
• Measure resistance: Disconnect the sensor and measure resistance at room temperature. Compare to Haier specifications (typically around 1000–1100 Ω at 25°C). Large deviations indicate a faulty sensor.
• Check connections: Reseat the sensor connector at both the sensor end and the control board end.
• Inspect wiring: Look for pinched or damaged wires, especially where the harness passes near hot surfaces.

When to replace parts: Replace the oven temperature sensor if resistance is out of spec. If the sensor and wiring are correct but E1 persists, the control board may be defective.