Unit blows air but airflow is very weak even at high fan speed.

Safety first: Turn off power before cleaning.

Steps to try:

• Clean or replace filters: This is the most common cause of weak airflow.
• Clean blower wheel: Remove the front cover and carefully brush or vacuum the blower fins.
• Clean evaporator coil: Use coil cleaner to remove embedded dust.

When to call a technician: If airflow remains weak, the fan motor may be failing and should be tested and replaced if necessary.