Display shows E5 and the unit will not heat, though the fan may still run.

Safety first: Unplug the Daewoo air fryer and allow it to cool. The heater and surrounding metal can remain hot for a long time.

Steps:

• 1. Visual inspection: Remove the top cover to access the heating element. Look for obvious breaks in the coil, burn marks, or discolored terminals.
• 2. Check connections: Ensure the spade connectors on both ends of the heating element are firmly attached and not oxidized. Reseat them if loose.
• 3. Test continuity of heater: Disconnect at least one heater lead and measure resistance across the element. A typical Daewoo air fryer heater will show a low but finite resistance (tens of ohms). If it reads open (OL), the element is faulty and must be replaced.
• 4. Inspect thermal fuse: Many Daewoo models include a thermal cutoff fuse in series with the heater, often wrapped in fiberglass sleeving near the element. Check for continuity across the fuse. If open, replace with an identical temperature and current rating component.
• 5. Examine wiring harness: Follow the high-temperature wires from the PCB to the heater. Look for brittle insulation, burns, or breaks. Replace any damaged wires with high-temperature rated cable.

Warning: Never bypass the thermal fuse permanently; it is a critical safety device. If you are unsure of ratings or wiring, consult a professional.