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TROUBLESHOOTING
Reset Operation
Note: When thermostat is reset, installer confi guration menu settings and programming will reset to factory settings.
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 (do not short them together) 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.
Note: Be sure to review the installer confi guration menu settings.
To reset the programming, clock and confi guration settings, press
and and the VENT button simultaneously. The
thermostat should go blank and then all segments will be displayed momentarily.
St. Louis, Missouri
HOMEOWNER HELP LINE: 1-800-284-2925
www.white-r odgers.com
White-Rodgers is a division
of Emerson Electric Co.
The Emerson logo is a
trademark and service mark
of Emerson Electric Co.
Symptom Possible Cause Corrective Action
No Heat/No Cool/No
Fan (common
problems)
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.
4. Loose connection to thermostat or system.
Replace fuse or reset breaker.
Turn switch to ON.
Replace door panel in proper position to engage safety interlock
or door switch.
Tighten connections.
No Heat
1. Pilot light not lit.
2. Furnace Lock-Out Condition. Heat
may also be intermittent.
3. Heating system requires service or
thermostat requires replacement.
Re-light pilot.
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 HVAC service person for assis-
tance.
Diagnostic: Set SISTEMA Switch to Calor and raise the set-
point above room temperature. Within a few seconds the thermo-
stat 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 HVAC
service person to verify the heating is operating correctly.
No Cool
1. Cooling system requires service or
thermostat requires replacement.
Same as diagnostic for No Heat condition except set the thermo-
stat to Frio and lower the setpoint below the room temperature.
There may be up to a fi ve minute delay before the thermostat
clicks in Cooling.
Heat, Cool or Fan
Runs Constantly
1. Possible short in wiring.
2. Possible short in thermostat.
3. Possible short in heat/cool/fan system.
4. VENT Switch set to VENT ON.
Check each wire connection to verify they are not shorted or
touching together. No bare wire should stick out from under ter-
minal block. Try resetting the thermostat as described above. If
the condition persists the manufacturer of your system or service
person can instruct you on how to test the Heat/Cool system for
correct operation. If the system operates correctly, replace the
thermostat.
Thermostat Setting &
Thermostat Thermometer
Disagree
1. Thermostat thermometer setting
requires adjustment.
The thermometer can be adjusted +/- 4 degrees. See Tempera-
ture Display Adjustment in the Confi guration Menu section.
Furnace
(Air Conditioner)
Cycles Too Fast or Too
Slow (narrow or wide
temperature swing)
1. The location of the thermostat and/or
the size of the Heating System may
be infl uencing the cycle rate.
Digital thermostats provide precise control and cycle
faster than older mechanical models. The system turns
on and off more frequently but runs for a shorter time so
there is no increase in energy use. If you would like an in-
creased cycle time, choose bA for slow cycle in the Con-
fi guration menu, step 6 (heat), 7 (cool) or 8 (heat pump).
If an acceptable cycle rate is not achieved, contact a local
service person for additional suggestions.