White Rodgers 90 SERIES 1F95-391 Operating Instructions Manual page 27

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. 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.
• One of the buttons is stuck down or
in. Check buttons, make sure nothing
is pushing them in.
• The thermostat sensor is not
functioning. If using a remote sensor,
check connections, wiring and power.
• The humidity sensor is not function-
ing. After checking the above, press
PROGRAM to reset the
RUN
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.
Adjustable Humidity Display.
The room humidity display can be
adjusted to read higher or lower by
following the configuration menu and
adjusting the humidity to a higher or
lower value (up to 20% RH). The
sensed humidity is calibrated at the
factory. If you want to adjust it, refer
to the CONFIGURATION section
(page 4, step 3).
Programmable Automatic
Humidity Reduction.
This feature automatically lowers
humidity when the outside tempera-
ture drops. This is to prevent the
interior windows/walls from reaching
the dew point where water condenses
on surfaces. To achieve automatic
25
Features
humidity reduction, the thermostat
lowers the humidity when furnace
cycles are long. When the furnace runs
shorter cycles, it increases humidity.
For suggested settings see table below.
OFF
Factory default — no humidity
reduction.
LO
Well insulated homes requiring
little humidity reduction.
HI
Poorly insulated homes or homes
with a lot of condensation on
windows/walls.
If your window insulation is poor, you
need high humidity reduction. If your
window insulation is good, you need
low humidity reduction (factory
setting). Selection of OFF will cancel
this feature. To adjust this feature, refer
to the CONFIGURATION section
(page 4, step 4).