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Backlighting (INDIGLO
®
night-light)
Your thermostat has an electroluminescent lamp that
backlights the display for easy viewing in the dark.
When any key is pressed or the System Switch is
changed, the display is illuminated.
The display will remain illuminated for 5 seconds after
the last key is pressed. This allows the light to stay on
if you need to operate several keys.
NOTE:
If the thermostat is in Low Battery warn-
ing condition, the backlight will not operate. Re-
place with 2 new alkaline batteries to restore the
Backlight function.