Instructions / Assembly

24
Symptom Possible Cause Corrective Action
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 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)
1. The location of the thermostat
and/or the size of 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 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.
Symptom Possible Cause Corrective Action
Cooling Cycles Too Fast or Too Slow
(narrow or wide temperature swing)
1. The location of the thermostat
and the size of the Cooling
System can influence the
cycle rate.
The cycle rate for cooling is xed and can not
be adjusted. Contact a local service person for
suggestions.
Thermostat Setting and Thermostat
Thermometer Disagree
1. Thermostat thermometer
setting requires adjustment.
The thermometer can be adjusted +/- 3 degrees.
See Temperature Display Adjustment in the
Operation section.
Blank Display and/or Keypad
Not Responding
1. Voltage spike or static
discharge.
2. Battery change required.
Replace batteries and check heat/cool system for
proper operation. If a voltage spike occurs use the
Reset Operation listed above.