How do I reset the dust filter reminder light after cleaning?
After cleaning the dust filter, hold the 'Fan' button for 3 seconds and the filter reminder light will turn off. This feature is a reminder to clean the dust filter for more efficient operation, and the LED illuminates after 250 hours of operation. (Page 16)
From the official Frigidaire FHWC054TE1 Window Air Conditioner manual, page 16
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