Safety first: Unplug the air fryer and allow it to cool completely before opening the case.

Confirm symptom: Start a short cycle and observe through the window. If the heating element never glows and there is no warmth from the exhaust, proceed with internal checks.
Access heater: Remove the outer cover to expose the heating element and its wiring.
Check thermal fuse: Locate the thermal fuse in series with the heater. Test for continuity; replace if open.
Test heating element: Disconnect the element leads and measure resistance. An open circuit indicates a failed element that must be replaced.
Inspect control board relay: If the element and fuse are good, check the heater relay on the main control board for burn marks or mechanical failure. Replace the main control board if the relay is not switching power to the heater.

Do not bypass safety devices like thermal fuses; always replace with correct-rated parts.

Air fryer powers on but does not heat; fan runs and timer counts down but food remains cold.

Possible Causes