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TROUBLESHOOTING
Symptom
No Cool
Heat, Cool or Fan Runs Constantly.
Furnace Cycles Too Fast or Too Slow
(narrow or wide temperature swing)
Cooling Cycles Too Fast or Too Slow
(narrow or wide temperature swing)
Thermostat Setting and Thermometer
Disagree
Clock Loses or Gains Time
Heat or Cool Starts Early
Thermostat Does Not Follow Program
Blank Display and/or Keypad Not
Responding
White-Rodgers is a division
of Emerson Electric Co.
The Emerson logo is a
trademark and service mark
of Emerson Electric Co.
Possible Cause
1. SYSTEM Switch not set to COOL
2. Loose connection to thermostat or system.
3. Cooling System requires service or thermostat
requires replacement.
1. FAN Switch set to Fan ON.
2. Possible short in wiring.
3. Possible short in thermostat.
4. Possible short in Heat/Cool/Fan system.
1. The location of the thermostat and/or the size
of the Heating System may be infl uencing the
cycle rate.
1. The location of the thermostat and/or the size
of the Cooling System may be infl uencing the
cycle rate.
1. Thermostat thermometer setting requires
adjustment.
1. Loss of power to thermostat and low batteries.
1. EMR activated
1. AM or PM set incorrectly in program.
2. AM or PM set incorrectly on the clock.
3. Voltage spike or static discharge.
1. Loss of power and dead batteries.
2. Voltage Spike or Static Discharge.
HOMEOWNER HELP LINE: 1-800-284-2925
St. Louis, Missouri
www.white-rodgers.com
Corrective Action
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 fi ve minute delay before
the thermostat clicks in Cooling if the compressor
lock-out option is selected in the confi guration
menu (Item 6).
Check each wire connection to verify they are
not shorted or touching together. No bare wire
should stick out from under terminal screws.
Try resetting the thermostat. 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.
Item 2 in the Confi guration Menu is the adjustment
that controls the cycle rate. If an acceptable cycle
rate is not achieved using the FA (Fast) or SL
(Slow) adjustment contact a local service person
for additional suggestions.
The cycle rate for cooling is fi xed and can not be
adjusted. Contact a local service person for
suggestions.
The thermometer can be adjusted +/- 4 degrees as
listed in item 7 of the Confi guration Menu. No other
adjustment is possible.
The thermostat will maintain its program in memory
even with no power/no batteries but the clock time
will be incorrect when power is restored. See No
Heat/No Cool/No Fan (common problems) above
for items to check in the system.
See Confi guration Menu (Item 4).
Check current clock and program settings including
the AM or PM designations for each time period.
If a voltage spike or static discharge occurs use the
Reset Operation listed above.
Replace batteries and check heat/cool system for
proper operation. If a voltage spike or static
discharge occurs use the Reset Operation
listed above.
Markham, Ontario
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