Display shows E03 and the air fryer will not heat; fan may still run.

Safety first: Unplug the air fryer and let it cool completely. Do not attempt to bypass any safety devices such as thermal fuses.

• Step 1 – Confirm symptom: Start a cook cycle and listen: if the fan runs but there is no warmth from the exhaust after 3–5 minutes and E03 appears, the heater circuit is suspect.
• Step 2 – External checks: Inspect the power cord and plug for damage or overheating. Try a different outlet to rule out supply issues.
• Step 3 – Internal inspection (advanced): With the unit unplugged, remove the top or rear cover to access the heating assembly. Look for burnt connectors, broken element coils, or discolored wiring.
• Step 4 – Check thermal fuse: Locate the thermal fuse (small cylindrical component in heat-shrink tubing near the element). If it appears burnt or cracked, it may be open. Testing requires a multimeter; replacement must be with the exact temperature and current rating.
• Step 5 – Do not bypass: Never bypass a thermal fuse or thermostat to "test" the unit. This creates a serious fire hazard.
• Step 6 – Professional repair: If the element or thermal fuse is open, or if you see heat damage on the control board, contact a professional or Ninja support for replacement parts and service.