LG air fryer shows H2 or similar low-temperature / preheat timeout error and food remains undercooked.

Safety first: Unplug and cool the unit before internal inspection.

Steps to address H2:

• Confirm behavior: Run a preheat cycle and monitor if the unit reaches the set temperature. Use an oven thermometer to verify.
• Inspect heater: Remove the cover to access the heating element. Look for dark spots, cracks, or partial breaks in the coil.
• Check connections: Ensure all heater terminals are tight and free of corrosion. Reseat connectors on the main PCB.
• Test heater resistance: Measure resistance across the element. A significantly higher resistance than spec can indicate a weakened element that heats poorly.
• Replace faulty parts: Replace a weak or damaged heating element with an LG-compatible assembly. If the sensor is misreading (e.g., reporting high temperature when cold), replace the sensor.

Note: If both heater and sensor are good, the main control board may not be supplying full power and should be evaluated by a technician.