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TROUBLESHOOTING
Symptom
No Cool
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
Thermostat Display Shows CHCK PAD,
CHNG FLTR, CALL SERV UV, CALL SERV
Possible Cause
1. SYSTEM button not pressed to display COOL. Set SYSTEM button until COOL is displayed and
2. Loose connection to thermostat or system.
3. Cooling system requires service or
thermostat requires replacement.
1. Possible short in wiring.
2. Possible short in thermostat.
3. Possible short in Heat/Cool/Fan system.
4. FAN button pressed to display FAN ON.
1. The location of the thermostat and/or the size
of the Heating System equipment may be
influencing the cycle rate.
1. The location of the thermostat and/or the size
of the Cooling System can influence the
rate.
1. Thermostat thermometer setting requires
adjustment.
1. Thermostat service indicators.
11
Corrective Action
raise temperature below room temperature.
Verify thermostat and system wires are securely
attached.
Same procedure as diagnostic for No Heat
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.
Check each wire connection to verify they are not
shorted or touching together. No bare wire should
out from under terminal screws. Try resetting the
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.
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 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.
The cycle rate for cooling is fixed and can not be
adjusted. Contact a local service person for
suggestions.
The thermometer can be adjusted +/- 5 degrees.
See Temperature Display Adjustment in the
Operating Manual under Configuration.
These indicators can be reset or modified in the
service button menu (see pg. 8).
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