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37
allows only the or to
operate for temporary temperature
overrides. It also limits the tempera-
ture to the maximum heating and
minimum cooling temperatures used
in your program. This is especially
useful in buildings where unsched-
uled events are common. Anyone
can change the temperature, but
only between the temperatures you
set and only for two hours or the
number of hours you specify if you
set up your Hold Till timing (see
Temporary Program Override (page
34). To select or deselect this
feature, refer to the CONFIGURA-
TION section (page 25, steps 12 and
13).
Battery Back-Up.Battery Back-Up.
Battery Back-Up.Battery Back-Up.
Battery Back-Up.
Three “AA” alkaline batteries allow
the thermostat to maintain its
program in the event of a power
loss. They also operate the back
light for viewing the display in low
light conditions, and allow for
armchair programming.
CHECK BATTERY will be
displayed when the batteries are
low. To assure optimum perfor-
mance, change batteries once a year
or when CHECK BATTERY is
displayed. When changing batteries,
always replace all three batteries
with new “AA” alkaline batteries
(for optimum performance, we
recommend Energizer
®
batteries). If
the batteries must be changed
frequently, it may indicate a
problem with the system. Contact
the heating/cooling system manufac-
turer or a service person. Remember
that excessive use of the display
light will reduce battery life.
System andSystem and
System andSystem and
System and
Thermostat Diagnostics.Thermostat Diagnostics.
Thermostat Diagnostics.Thermostat Diagnostics.
Thermostat Diagnostics.
The display will indicate CHECK
SYSTEM if the room temperature
does not rise within two hours of the
call for heat. After two hours the
thermostat will quit calling for heat
for one minute (this allows some
furnaces to reset) and call for heat
again. It will repeat this sequence
three times. If the temperature still
does not rise, it will continue to call
for heat. This normally indicates the
heating system is not working
correctly. You may wish to consult
your furnace manufacturer or
service person.
The display will indicate CHECK
STAT if one of the following occurs.
Features