How do I reset the electronic filter change reminder after replacing a filter?

After replacing the appropriate filter, the 'Check Filter' or 'Check Pre-Filter' light will remain on until it is manually reset. With the unit powered on, press the illuminated button and hold for approximately 2 seconds until the light turns off. If you replace a filter before the indicator light comes on, plug the unit in without powering it on, press and hold each button individually for at least 5 seconds to illuminate it, then press and hold each button until the light goes off to reset it to its original 'clean' status. (Page 3)