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TROUBLESHOOTING
Symptom
Possible Cause
1.) Blown fuse or tripped circuit
breaker
2.) Furnace power switch to OFF
No Heat/
No Cool/
3.) Furnace blower compartment
No Fan
door panel loose or not
(common problem)
properly installed
4.) Loose connection to
thermostat or system
1.) System Switch not set to
Heat
2.) Loose connection to
thermostat or system
3.) Heating System requires
service or thermostat
requires replacement
No Heat
1.) System Switch not set to
Cool
2.) Loose connection to
thermostat or system
3.) Cooling System requires
No Cool
service or thermostat
requires replacement
Possible short in wiring,
Heat, Cool or Fan
thermostat, heat, cool or fan
Runs Constantly
system
Thermostat Display
Thermostat display requires
& Thermometer
adjustment
Disagree
(Troubleshooting continued on next page)
7
Corrective Action
1.) Replace fuse or reset breaker
2.) Turn switch to ON
3.) Replace door panel in proper position to engage
safety interlock or door switch
4.) Tighten Connections
Verify thermostat and system wires are securely
attached.
Diagnostic: Set System Switch to Heat and raise
the setpoint above room temperature. Within five
minutes the thermostat should make a soft click
sound and "Heat On" should appear on display.
This sound indicates the thermostat is operating
properly. If the thermostat does not click, try the
reset operation listed below. 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 system is operating correctly.
Verify thermostat and system wires are securely
attached.
Diagnostic: Set System Switch to Cool and lower
setpoint below room temperature. Same procedures
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 if the
compressor lock-out option is selected in the installer
menu. (see INSTALLER MENU, item 50)
Check each wire connection to verify they are not
shorted or touching other wires. Try resetting the
thermostat. If the condition persists contact your
HVAC service person.
Display can be adjusted +/-5°. See User Menu item
04
TROUBLESHOOTING (C0ntinued)
Symptom
Possible Cause
Furnace (Air
Conditioner)
The location of the thermostat
Cycles Too Fast or
and/or the size of the Heating
Slow (narrow or
System may be influencing the
wide temperature
cycle rate
swing)
1.) Heating system is not able
to heat the space to within
10 degrees of the setpoint
within 2 hours
2.) Cooling system is not able
to cool the space to within
10 degrees of the setpoint
within 2 hours
"Call for Service"
3.) If "--" is displayed for the
icon appears on
Room Temperature, a
displayed
replacement thermostat is
needed
4.) None of the buttons operate
on the thermostat
Resetting the Thermostat or Thermostat Settings
If the thermostat has good batteries, but has a blank display or does not respond to key
presses, the thermostat should be reset by removing the batteries for 2 minutes. This reset
will not change the menu settings. If the condition persists after reinstalling the batteries,
replace the thermostat.
To conveniently reset only the user settings back to factory defaults, press Menu and Back-
light buttons at the same time and hold until the display goes blank and resets.
HOMEOWNER HELP LINE: 1-800-284-2925
White-Rodgers is a business
of Emerson Electric Co.
The Emerson logo is a
trademark and service mark
www.white-rodgers.com
of Emerson Electric Co.
www.emersonclimate.com
Corrective Action
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. If you would like to increase cycle time, choose
SLO for slow cycle in the Installer menu. (Reference
menu items 30 & 35) If an acceptable cycle rate is not
achieved, contact your HVAC service person.
1.) See corrective action for "No Heat"
2.) See corrective action for "No Cool"
3.) Replace thermostat
4.) Make sure keypad lockout is not turned on
(denoted by icon)
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