White Rodgers 90 Operating Instructions Manual page 17

The following steps will allow you to
change the number of hours for filter
change-out.
1. If CHNG FLTR is on the display,
press the FILTER key once to reset
the timer. If you do not see CHNG
FLTR proceed to step 2.
2. Press the FILTER key, The display
will show SET FILTER TIME and the
number of hours remaining before
CHNG FLTR indicator will display.
3. Press the FILTER key a second
time. The display will show SET
FILTER TIME and will show the
number of hours to filter change.
4. Press TIME or TIME
FWD
to change the time to your require-
ments.
5. Press PROGRAM
RUN
to the normal operating mode.
NOTE: If unsure what interval to use
between filter changes or cleaning,
contact the manufacturer of your
heating/cooling equipment.
System and Thermostat Diag-
nostics.
The display will indicate CHECK
SYS 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
BACK
consult your furnace manufacturer or
service person.
The display will indicate CHECK
to return
STAT if one of the following occurs.
• One of the keys is stuck down or in.
Check the keys, make sure nothing is
pushing them in.
• The thermostat sensor is not
functioning. If using a remote sensor,
check connections, wiring and power.
After checking the above, press
PROGRAM
display. If this does not clear the
display, disconnect power for five
minutes.
If these checks fail to solve the
problem, the thermostat should be
replaced.
Temporary Program Override.
Any time your program is running and
you would like to override it for a
specific amount of time, press
or
want is displayed. The display will
indicate HOLD, and the number of
hours remaining in the hold period will
be indicated with the word HRS. To
adjust the length of time for the
override, press TIME
BACK
15
to reset the
RUN
until the temperature you
or TIME
FWD
. HOLD TILL will be displayed
Features