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No Cool 1. SYSTEM button not pressed to display COOL. Set SYSTEM button until COOL is displayed and
raise temperature below room temperature.
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 press the SYSTEM button until
COOL is displayed and lower the setpoint below
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. out from under terminal screws. Try resetting the
4. FAN button pressed to display FAN ON. thermostat as described on the previous page. 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 1. The location of the thermostat and/or the size Digital thermostats normally provide precise
(narrow or wide temperature swing) of the Heating System equipment 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 on 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, refer to page 6 under Installer Table for
settings. If an acceptable cycle rate is not acheived
by the adjustment in the Installer Table then you
may want to contact a local heating and air
conditioning service person for further suggestions.
Cooling Cycles Too Fast or Too Slow 1. The location of the thermostat and/or 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
rate. suggestions.
Thermostat Setting and Thermostat 1. Thermostat thermometer setting requires The thermometer can be adjusted +/- 5 degrees.
Thermometer Disagree adjustment. See Temperature Display Adjustment in the
Operating Manual under Configuration.
Thermostat Display Shows CHCK PAD, 1. Thermostat service indicators. These indicators can be reset or modified in the
CHNG FLTR, CALL SERV UV, CALL SERV service button menu (see pg. 8).
TROUBLESHOOTING
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Symptom Possible Cause Corrective Action