Microwave fan runs but there is little or no airflow from the front or top vents (over-the-range models).

Safety first: Unplug the microwave before removing filters or grilles.

Steps:

• Clean grease filters: Remove the metal grease filters from the bottom of the Hisense over-the-range microwave and clean them with hot, soapy water. Dry completely before reinstalling.
• Check recirculation vs. external venting: Ensure the blower is configured correctly for your installation (recirculating or vented to outside) according to the installation manual.
• Inspect external vent: If vented outside, check the wall or roof cap for obstructions or stuck dampers.

If airflow is still poor:

• A technician may need to inspect the exhaust fan motor, blower wheel, and internal ducting.