Whirlpool air conditioner displays CF after a certain number of operating hours but continues to run.

Note: CF is typically not a fault but a reminder to clean the air filter.

Steps:

• Turn the unit off and remove the air filter.
• Vacuum or wash the filter with mild soap and water. Allow it to dry completely.
• Reinstall the filter.
• Reset the filter reminder according to the user manual (often by holding the Filter or Timer button for several seconds).