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TROUBLESHOOTING
Reset Operation
If a voltage spike or static discharge blanks out the display or
causes erratic thermostat operation, you can reset the system
by removing batteries for 2 minutes. After resetting the
system, replace the batteries. If the system has been reset
and still does not function correctly perform a power reset.
Note: Be sure to review the installer configuration menu
settings.
Note: When thermostat is reset, installer configuration menu
settings and programming will reset to factory settings.
To reset the programming, clock and configuration
settings, press and and the SYSTEM touch keys
simultaneously. The thermostat should go blank and then all
segments will be displayed momentarily.
Symptom Possible Cause Correction Action
No Heat/No Cool/No Fan
(common problems)
1. Blown fuse or tripped circuit breaker.
2. Power switch to OFF.
3. Furnace blower compartment door or
panel loose or not properly installed.
4. Loose connection to system.
Replace fuse or reset breaker.
Turn switch to ON.
Replace door panel in proper position to engage safety
interlock or door switch.
Check connections.
No Heat
1. Pilot light not lit.
2. Furnace Lock-Out Condition. Heat
may also be intermittent.
3. Heat pump system requires service.
See fault code table Comfort Alert.
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 assistance.
No Cool
1. Cooling system requires service.
See fault code table Comfort Alert.
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. FAN Switch set to Fan ON.
Check each wire connection to verify they are not shorted
or touching together. No bare wire should stick out from
under terminal 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 display setting
requires adjustment.
The display can be adjusted +/- 5 degrees. See
Temperature Display Adjustment in the Configuration 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 influencing 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 increased cycle
time, choose SL for slow cycle in the Configuration menu.
Comfort Alert™ Fault Codes
Number Displayed in
7 Segment LED
Comfort Alert Fault
P Trip
1 Long Run Time
2 System Pressure Trip
3 Short Cycling
4 Locked Rotor
5 Open Circuit
6 Open Start Circuit
7 Open Run Circuit
8 Welded Contactor
9 Low Voltage
System Communication Codes
E Communication Error
C For 30 seconds after Communication
established, then blank
White-Rodgers is a division
of Emerson Electric Co.
The Emerson logo is a
trademark and service mark
of Emerson Electric Co.