Air fryer will not start and displays E1 immediately when powered or when START is pressed.

Safety first: Unplug the Daewoo air fryer from the mains and allow it to cool completely before opening the housing. Capacitors on the control board can retain charge; avoid touching bare solder joints.

Step-by-step checks:

• 1. Power reset: Unplug the unit for 5–10 minutes, then plug back in and try again. If E1 returns immediately, continue.
• 2. Access the top housing: Remove the screws on the back and/or underside (varies by Daewoo model). Carefully lift the top cover to expose the control PCB and wiring harnesses.
• 3. Locate the NTC sensor: Find the small probe or bead-type sensor fixed to the inner metal cavity or near the heating element, usually with two thin wires going to the control board. On Daewoo air fryers this is often a 100K NTC sensor in a metal sleeve.
• 4. Check the connector: Ensure the 2-pin sensor plug is fully seated on the main PCB. Look for bent pins, corrosion, or heat damage. Reseat the connector several times to clean contacts.
• 5. Inspect the wiring: Follow the sensor wires from the cavity to the PCB. Look for cuts, melted insulation, or breaks where the harness passes through metal panels. Repair minor damage with high-temperature rated wire and heat-shrink, or replace the harness.
• 6. Test the sensor (if you have a meter): Disconnect the sensor from the PCB and measure resistance across the two leads. At room temperature (20–25°C) a typical Daewoo NTC will read tens of kilo-ohms. If it reads open (OL) or near 0 Ω, the sensor is faulty.
• 7. Inspect the PCB input: Check the area of the board where the sensor plugs in. Look for burnt components, cracked solder joints, or lifted tracks. Reflow cracked joints with a soldering iron if you are competent; otherwise replace the board.

When to stop: If the sensor and wiring test good but E1 persists, the fault is likely in the control PCB’s sensor circuit. Replacement of the main PCB is recommended and is best done by a qualified technician.