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No Heat/No Cool/No Fan 1. Blown fuse or tripped circuit breaker. Replace fuse or reset breaker.
(Common Problems) 2. Furnace power switch to OFF. Turn switch to ON.
3. Furnace blower compartment door or Replace door panel in proper position to engage
panel loose or not properly installed. safety interlock or door switch.
No Heat 1. Pilot light not lit. Re-light pilot.
2. SYSTEM button not pressed to display HEAT. Set SYSTEM button until HEAT is displayed and
raise temperature above room temperature.
3. Loose connection to thermostat or system. Verify thermostat and system wires are securely
attached.
4. Furnace Lock-Out Condition. Heat may also Many furnaces have safety devices that shut
be intermittent. down when a lock-out condition occurs. If the
heat works intermittently contact the furnace
manufacturer or local service person for
assistance.
5. Heating system requires service or Diagonistic: Set SYSTEM button until HEAT is
thermostat requires replacement. displayed and raise setpoint above room
temperature. Within a few seconds the thermostat
should make a soft click sound. This sound
usually indicates the thermostat is operating
properly. If the thermostat does not click, try the
reset operation listed on the previous page. If the
thermostat does not click after being reset
contact your heating and cooling service person
or place of purchase for replacement. If the
thermostat clicks, contact the furnace manufacturer
or a service person to verify the heating system is
operating correctly.
10
TROUBLESHOOTING
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.
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.
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