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Symptom Possible Cause Corrective Action
No Cool 1. System Switch not set to Cool. Set System Switch to Cool and lower temp below
room temp.
2. Loose connection to thermostat or system. Verify thermostat and system wires are securely
attached.
3. Cooling system requires service or Same procedure as diagnostic for No Heat
thermostat requires replacement. 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. 1. Possible short in wiring. Check each wire connection to verify they are not
2. Possible short in thermostat. shorted or touching together. No bare wire should
3. Possible short in heat/cool/fan system. stick out from under terminal screws. If the
4. Fan Switch set to Fan On. 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 1. The location of the thermostat and/or the Digital thermostats normally provide precise
(narrow or wide temperature swing) size of the Heating System may be temperature control and may cycle faster than
influencing the cycle rate. 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, go to menu mode as
mentioned in the instructions 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 changing cycle time from FAST to
SLOW on the menu mode contact a local
service person for additional suggestions.
Cooling Cycles Too Fast or Too Slow 1. The location of the thermostat and the size The cycle rate for cooling is fixed and can not be
(narrow or wide temperature swing) of the Cooling System can influence the adjusted. Contact a local service person for
cycle rate. suggestions.
Thermostat Setting and Thermostat 1. Thermostat thermometer setting requires The thermometer can be adjusted +/- 4 degrees.
Thermometer Disagree adjustment. See Temperature Display Adjustment in the
Operation section.
Blank Display and/or Keypad 1. Thermostat loss of power Check possible blown fuse or tripped breaker.
Not Responding 2. Voltage spike or static discharge. Turn the system power off. Wait for 5 minutes and
turn the power on.
TROUBLESHOOTING
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