Installing or Changing the Batteries
To remove the battery compartment gently
squeeze the ribbed edges on both sides.
The battery compartment will pull down
from the thermostat body and will detach.
Install two AA batteries following the
polarity as shown inside the compartment.
Place compartment back into the
thermostat.
When the batteries are low the thermostat will enter a low battery mode.
Low battery mode has two levels.
• LEVEL 1: The low battery icon will be displayed.
The thermostat will continue to operate. Replace
the batteries as soon as possible
• LEVEL 2: The low battery icon will flash. If 24V AC is
present the thermostat will continue to operate if
the batteries are discharged or removed. If 24V AC
is not present the thermostat runs on batteries only
and THE SYSTEM WILL NOT OPERATE. Replace
batteries immediately.
Replace batteries if leaving thermostat unattended for more than 30 days.
Display Description
The thermostat display will show information that is being used during
operation or programming. This illustration shows all of the display’s
possibilities with an explanation.
3
1. Used with setpoint.
2. Used for current setpoint and some configuration data.
3. HVAC mode and status. Icons blink when active. A is
for Auto, 2 is for second stage, E is for emergency.
Both the 2 and E will be displayed when 3rd stage heat
is active.
4. Indicates when security is active.
5. Low battery indicator.
6. Used for ambient temperature and configuration data
(e.g., first stage differential, F or C, etc.).
7. Fan status (rotates when active).
8. Fan mode selected by pressing FAN button.
4
2
1
5
3
6
7
8
