How do I reset the Electronic Filter Change indicator after replacing the filters?

After replacing the filters, plug the unit back in — the 'Check Filters' or 'Check Pre-Filter' light will remain on until reset. With the unit powered off, press the lighted button and hold for approximately 3 seconds until the light turns off. If you replaced filters before the indicator light came on, press and hold the appropriate button for 5 seconds while the unit is plugged in but powered off; the light will flash red twice to confirm the reset. (Page 7)