White Rodgers 1f78 Installation Instructions Manual page 6

7
TROUBLESHOOTING
CONTINUED FROM FIFTH PAGE
Symptom
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
Thermostat Thermometer
Disagree
Blank Display and/or Keypad 1. Voltage spike or static discharge.
Not Responding
The Emerson logo is a
trademark and service mark
of Emerson Electric Co.
Possible Cause
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.
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 the size
of the Cooling System can infl uence the
cycle rate.
1. Thermostat thermometer setting requires
adjustment.
2. Battery change required.
HOMEOWNER HELP LINE: 1-800-284-2925
www.white-rodgers.com
Corrective Action
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 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.
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 for Hydronic Heating
Systems. It is not possible to shorten the cycle
time. If an acceptable cycle rate is not achieved as
received or by clipping W-905 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 +/- 3 degrees.
See Temperature Display Adjustment in the
Operation section.
Replace batteries and check heat/cool system
for proper operation. If a voltage spike occurs use
the Reset Operation listed above.