Low Battery Warning - Honeywell T4 Pro User Manual

1. The batteries need to be replaced when
BATT, the alert icon , and the battery icon
are displayed on the Home screen.
2. When the battery power is very low, the
thermostat backlight is disabled to save
battery power.
3. When battery power is critically low, only
BATT, the alert icon , and the battery icon are
displayed.

Low Battery Warning