How do I reset the electronic filter check reminder lights?

After replacing the appropriate filters, plug the unit back in and with the unit powered OFF, press and hold the lighted "Check Filters" or "Check Pre-Filter" button for approximately 3 seconds until the light turns off. If you change the filter before the Electronic Filter Check lights are illuminated, press and hold the appropriate button for 5 seconds with the unit plugged in and powered off, and the light will flash red twice to signal that the indicator has been reset.