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TROUBLESHOOTING
FAN OPERATION
If your system does not have a G terminal
Connection, skip to HEAT/HUMIDITY
section below.
1. Turn power on to the system.
2. Press PROGRAM
RUN
.
3. Press
FAN
until FAN ON is displayed.
The fan should begin to operate.
4. Press
FAN
until FAN AUTO is
displayed. The fan should stop operating,
unless a call for heat or cool is active.
HEAT/HUMIDITY
1. Press the
SYSTEM
button until HEAT is
shown at the top of the display.
2.Press the HUMIDITY % button, then
the temperature to the
maximum humidity setpoint and hold
for 5 seconds until ON is displayed.
3.Press the PROGRAM
RUN
.
4.Press the HOLD button.
5.Press the temperature to
raise the temperature setting 4°F
above room temperature. The 1
st
stage
(LED Green) and then 2
nd
stage
(LED Yellow) will be energized,
and also the HM terminal should
energize for humidification. The
lowercase letter h will appear to the
RESET BUTTON
If the thermostat does not respond when keys
are pressed, or the thermostat is not operating
properly, you may use the reset button
located on the back of the thermostat body
(see fig. 2). Thermostat programming and
configuration will not be affected by
pressing the reset button. However, the clock
will need to be reset.
CHECK THERMOSTAT OPERATION
RESETTING THERMOSTAT
CONFIGURATION AND
PROGRAMMING
The thermostat can be reset back to default
programs and configuration. Removing
power from the thermostat will not reset it,
because the default settings are maintained in
permanent memory. Before resetting the
thermostat, you may want to make note of
the previously selected configuration and
programming. You must reconfigure and
reprogram the thermostat after resetting it
using this method.
To reset the thermostat, press and release
PROGRAM
RUN
, then press the
FAN
,
TIME
BACK
and buttons at the same
time. This will reset the thermostat to
factory default programs and configuration.
The display will momentarily go blank,
then all segments on the display will
momentarily be shown. The thermostat will
then go into the HOLD mode and will
maintain factory preset temperatures.
right of HOLD, indicating that the
thermostat is calling for Humidification.
If configured for Heat Pump 1, 2, or 3
the third stage of HEAT will be indi-
cated by a Flashing Yellow light.
6.Press the HUMIDITY % button and
set your desired humidifier set point
in % RH with the and .
7. Press the PROGRAM
RUN
to
accept the change.
HEAT PUMP EMERGENCY
HEAT MODE
1. Press the
SYSTEM
button to select the
EMER mode.
2.Press the temperature
to
raise the setpoint temperature 2°F
above the room temperature to call
for heat.
3. LED indicatior will glow red indicat-
ing the thermostat is calling for heat.
4. Lower the termperature a few degrees
below room temperature and the red
LED and the heat should turn off.
NOTE: If the red LED flashes and
check system appears this signals that
there is a malfunction in the Heating/
Cooling system not the thermostat. For
suggestions contact your Heating/
Cooling manufacturer.
COOL/DEHUMIDIFY
1. Press the
SYSTEM
button until COOL is
shown at the top of the display.
2.Press the HUMIDITY % button, then
the temperature to the minimum
humidity setpoint and hold for 5
seconds until ON displayed.
3. Press the PROGRAM
RUN
button.
4. Press the HOLD button.
5. Press the temperature to lower
the temperature setting 1°F
below room temperature and the 1
st
stage of the COOLING system
should begin to operate and the LED
indicator will glow green for first
stage. The lowercase letter d will
appear to the right of HOLD, indicat-
ing that the thermostat is calling for
Dehumidification.
6.Press the temperature to lower
your setpoint 4°F below room
temperature, the DHM terminal will
energize causing the FAN to go to
high speed.
7.Press the HUMIDITY % button and
set your desired dehumidification
setpoint in % RH using the and
.
8.Press PROGRAM
RUN
to accept
the change.
Symptom Possible Cause Corrective Action
Thermostat Does Not Follow Program 1. AM or PM set incorrectly in program. Check current clock and program settings including
2. AM or PM set incorrectly on clock. AM or PM designations for each time period. If a
3. Voltage spike or static discharge. voltage spike or a static discharge occurs use
the reset operation listed above.
Blank Display and/or Keypad Not Responding 1. Voltage spike or static discharge. Replace batteries and check heat/cool system
2. Battery change required. for proper operation. If a voltage spike occurs
use the Reset Operation listed above.
TROUBLESHOOTING
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