Use and Care Manual

www.white-rodgers.com
Symptom Possible Cause Corrective Action
No Heat (continued)
5. Heating system requires service or thermostat
requires replacement.
Diagnostic: Set SYSTEM Switch to 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 ther-
mostat 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.
No Cool
SYSTEM Switch not set to COOL. 1.
Loose connection to thermostat or system. 2.
Cooling system requires service or thermostat 3.
requires replacement.
Set SYSTEM Switch to COOL and lower setpoint
temperature 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 five minute delay before the
thermostat clicks in Cooling.
Heat, Cool or Fan Runs Constantly.
Possible short in wiring.1.
Possible short in thermostat.2.
Possible short in heat/cool/fan system.3.
FAN Switch set to Fan ON.4.
C h e c k e a c h w i r e c o n n e c t i o n t o v e r i f y t h e y a r e n o t
shorted or touching together. No bare wire should
stick out from under terminal screws. 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.
Furnace Cycles Too Fast or Too Slow
(narrow or wide temperature swing)
The location of the thermostat and/or the size of 1.
the Heating System may be
influencing the cycle rate.
Digital thermostats normally provide precise
temperature control and may cycle faster than
some older mechanical models. A faster cycle rate
means the unit turns on and off more frequently
but runs for a shorter time so there is no increase
in energy use. If you would like to increase the
cycle time, clip Jumper W-905 as mentioned in the
instructions for Hydronic Heating Systems. It is not
possible to shorten the cycle time. If an accept-
able cycle rate is not achieved as received or by
clipping W-905 contact a local service person for
additional suggestions.
Cooling Cycles Too Fast or Too Slow
(narrow or wide temperature swing)
The location of the thermostat and the size of 1.
the Cooling System can influence the cycle rate.
The cycle rate for cooling is fixed and can not be
adjusted. Contact a local service person for sug-
gestions.
Thermostat Setting and Thermostat
Thermometer Disagree
Thermostat thermometer setting requires adjust-1.
ment.
The thermometer can be adjusted +/- 3 degrees.
See Temperature Display Adjustment in the
Operation section.
Thermostat Does Not Follow Program
AM or PM set incorrectly in program.1.
AM or PM set incorrectly on the clock.2.
Voltage spike or static discharge.3.
Check current clock and program settings includ-
ing the AM or PM designations for each time pe-
riod. If a voltage spike or a static discharge occurs
use the Reset Operation listed above.
Blank Display and/or Keypad
Not Responding
Voltage spike or static discharge.1.
Battery change required.2.
Replace batteries and check heat/cool system
for proper operation. If a voltage spike occurs use
the Reset Operation listed above.
8
TROUBLESHOOTING
CONTINUED FROM SIXTH PAGE