Unit displays CF after extended operation; cooling may still work but airflow is reduced.

Note: CF is typically a maintenance reminder, not a fault.

Steps:

• Clean filters: Remove, wash, and dry the filters thoroughly.
• Vacuum coil surface: Gently vacuum the front of the evaporator coil to remove loose dust.
• Reset reminder: Press and hold the filter reset button on the remote or indoor panel (refer to Tristar manual) until CF clears.