GE GNUT05Z01 Owner's Manual page 7

Indicator
light
Electronic Indicator Light—
light on the base of the faucet is a six month timer that
shows you when to replace the filter cartridges. When
the battery pack is first installed, the indicator light will
light briefly to show that the electronics are operating.
If this does not happen, the batteries could be installed
backwards or the leadwires are not connected.
After about six months, the indicator light begins to
flash. It is time to replace the filter cartridges. When
replacing the filter cartridges, also replace the batteries
in the battery pack. Two "AA" batteries are required.
The electronic indicator
7