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TROUBLESHOOTINGTROUBLESHOOTING
TROUBLESHOOTINGTROUBLESHOOTING
TROUBLESHOOTING
Reset OperationReset Operation
Reset OperationReset Operation
Reset Operation
If a voltage spike or static discharge blanks out the display or causes erratic thermostat operation, you can reset the thermo-
stat by removing the wires from terminals R and C and removing batteries for 2 minutes. After resetting the thermostat,
replace the wires and batteries. 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.
SymptomSymptom
SymptomSymptom
Symptom
No Heat/No Cool/No FanNo Heat/No Cool/No Fan
No Heat/No Cool/No FanNo Heat/No Cool/No Fan
No Heat/No Cool/No Fan
(common problems)(common problems)
(common problems)(common problems)
(common problems)
No HeatNo Heat
No HeatNo Heat
No Heat
No CoolNo Cool
No CoolNo Cool
No Cool
Thermostat does notThermostat does not
Thermostat does notThermostat does not
Thermostat does not
Follow ProgramFollow Program
Follow ProgramFollow Program
Follow Program
Possible CausePossible Cause
Possible CausePossible Cause
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
HEATHEAT
HEATHEAT
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
COOLCOOL
COOLCOOL
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.
Corrective ActionCorrective Action
Corrective ActionCorrective Action
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 HEAT
HEAT HEAT
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
intermittently contact the furnace manufacturer or
local service person for assistance.
Diagnostic: Set SYSTEM Switch to
HEAT HEAT
HEAT HEAT
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 COOL
COOL COOL
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 COOL
COOL COOL
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.