Indoor unit displays lights but airflow is very weak even on high fan setting

Safety first: Turn off power before cleaning or touching the fan.

Steps to try:

• Clean or replace filters: Dirty filters are the most common cause of weak airflow.
• Inspect blower wheel: Remove the front cover and look for thick dust on the blower blades. Clean with a brush and vacuum.
• Check intake clearance: Ensure furniture or curtains are not blocking the air intake at the top/front of the unit.
• Test fan speeds: After cleaning, run the unit and cycle through fan speeds. If airflow remains weak, the motor may be failing.

When to call a pro: A technician can test motor voltage and replace the indoor fan motor if necessary.