
Possible Cause
1. Blown fuse or tripped circuit breaker.
2. Furnace power switch to OFF.
3. Furnace blower compartment door or
panel loose or not properly installed.
1. Pilot light not lit.
2. SYSTEM Switch not set to HEAT.
3. Loose connection to thermostat or
system.
4. Furnace Lock-Out Condition. Heat
may also be intermittent.
5. Heating system requires service or
thermostat requires replacement.
1. SYSTEM Switch not set to COOL.
2. Loose connection to thermostat or
system.
3. Cooling system requires service or
thermostat requires replacement.
1. Program or current time(s) set
incorrectly (AM, PM or Day of the
week).
2. Energy Management Recovery
(EMR) starting the program early.
In power stealing mode (RC/PS Switch
set to PS), the thermostat draws a small
amount of power through the heating circuit
to operate. Some furnace systems using
high impedance input electronic modules
may react to the current draw and actuate
system components.
1. Loss of power from heating/cooling
system to thermostat.
2. Remote sensor too far from thermostat.
3. Thermostat or remote sensor set to
different channels or a different frequency
offset.
4. Incorrect sensor identification selected.
5. Replacement Sensor requires
running learn mode.
6. Remote sensor requires replacement.
TROUBLESHOOTING
Reset Operation
If a voltage spike or static discharge blanks out the display or causes erratic thermostat operation, you can reset the
thermostat by removing the wires from terminals R and C for 2 minutes. After resetting the thermostat, replace the wires . If
the thermostat has been reset and still does not function correctly contact your heating/cooling service person or place of
purchase.
Pressing
and and the SYSTEM keys at the same time will reset the thermostat to its factory default setting. This will
also clear any limited temperature ranges or keypad lockout settings. Note default system configuration is multistage system
operation.
Symptom
No Heat/No Cool/No Fan
(common problems)
No Heat
No Cool
Thermostat does not
Follow Program
Furnace Inducer Fan,
Blower or Heat Turns On
with No Call for Heat or
does not Turn Off when
Call for Heat Ends
Antenna + Fault
Corrective Action
Replace fuse or reset breaker.
Turn switch to ON.
Replace door panel in proper position to engage safety
interlock or door switch.
Re-light pilot.
Set SYSTEM Switch to HEAT and raise setpoint above
room temperature.
Verify thermostat and system wires are securely attached.
Many furnaces have safety devices that shut down when
a lock-out condition occurs. If the heat works intermit-
tently contact the furnace manufacturer or local service
person for assistance.
Diagnostic: Set SYSTEM Switch to HEAT and raise the
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 above. If the thermostat does not click
after being reset contact your heating and cooling service
person or place of purchase for a replacement. If the
thermostat clicks, contact the furnace manufacturer or a
service person to verify the heating is operating correctly.
Set SYSTEM Switch to COOL and lower setpoint
below room temperature.
Verify thermostat and system wires are securely
attached.
Same procedure as diagnostic for No Heat condition
except set the thermostat to COOL and lower the setpoint
below the room temperature. There may be up to a five
minute delay before the thermostat clicks in Cooling.
Verify that the AM or PM settings are correct for
each program period and the current time of day.
Also verify the Day of the week is set correctly.
The EMR (Energy Management Recovery) feature
starts early to achieve the temperature it is pro-
grammed for by the time specified in the program.
See the Configuration Menu section to disable
EMR if you do not want the thermostat to start early.
1. Add a common connection from the system trans-
former to the "C" terminal on the thermostat and set the
RC/PS switch to RC.
2. If the system has a standard cooling contactor and no
common connection is available at the thermostat, clip
jumper W25-W1 and separate the ends. This prevents
the thermostat from drawing power from the W1
(heating) circuit. If the condition persists after clipping
the jumper, a heating and cooling service person can
install an isolation relay to the system or add a common
wire as mentioned above.
1. Verify the thermostat is operating on AC power by
removing the thermostat batteries. If display goes
blank, AC power is lost.
2. Change remote sensor location.
3. Verify the thermostat and remote sensor are set to the
same channel and frequency offset.
4. For indoor sensor, verify sensor identification selected
is A, B or C. For an outdoor sensor, verify the sensor
identification selected is O.
5. If the sensor did not come with this thermostat from
the factory, perform the learn procedure for thermo-
stat and sensor.
6. If the sensor display indicate E0 or E1, replace the
remote sensor.
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