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9
TROUBLESHOOTING
Reset Operation
If a voltage spike or static discharge blanks out the display
or causes erratic thermostat operation, reset the thermostat
by pressing the , and TIME buttons simultaneously.
If the thermostat has power, has been reset and still does not
functioncorrectlycontactyourheating/coolingserviceperson
or place of purchase.
Symptom Possible Cause Corrective Action
No Heat/No Cool/No Fan
(common problems)
1.Blownfuseortrippedcircuitbreaker.
2. Furnace power switch to OFF.
3.Furnaceblowercompartmentdooror
panel loose or not properly installed.
Replace fuse or reset breaker.
Turn switch to ON.
Replace door panel in proper position to engage safety
interlock or door switch.
No Heat
1.SystemSwitchnotsettoHeat.
2. Loose connection to thermostat or
system
3.HeatingSystemrequiresserviceor
thermostat requires replacement.
SetSystemSwitchtoHeatandraisesetpointabove
room temperature.
Verifythermostatandsystemwiresaresecurelyattached.
Diagnostic:SetSystemSwitchtoHeatandraisethe
setpointaboveroomtemperature.Withinaveminutes
the thermostat should make a soft slick sound. This
sound usually indicates the thermostat is operating
properly. If the thermostat does not click, try the reset
operation listed above. If the thermostat does not click
after being reset contact your heating and cooling
service person or place of purchase for a replacement.
If the thermostat clicks, contact the furnace manufac-
turer or a service person to verify the heating system is
operating correctly.
No Cool
1.SystemSwitchnotsettoCool.
2. Loose connection to thermostat or
system.
3.CoolingSystemrequiresserviceor
thermostat requires replacement
SetSystemSwitchtoCoolandlowersetpointbelow
room temperature.
Verifythermostatandsystemwiresaresecurelyattached.
SameproceduresasdiagnosticforNoHeatcondi-
tion 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 if the compressor lock-out option is selected in
thecongurationmenu(Item6).
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 below. 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
Cooling Cycles Too Fast or Too Slow
(narrow or wide temperature swing)
1.Thelocationofthethermostatand/
orthesizeoftheHeatingorCooling
Systemmaybeinuencingthe
cycle rate.
Item4(CRHeat)or5(CRCool)intheConguration
Menuistheadjustmentthatcontrolsthecyclerate.If
an acceptable cycle rate is not achieved using the FA
(Fast)orSL(Slow)adjustmentcontactalocalservice
person for additional suggestions.
Thermostat Setting and
Thermometer Disagree
1.Thermostatthermometersetting
requiresadjustment.
Thethermometercanbeadjusted+/-4degreesas
listedinitem8oftheCongurationMenu.Noother
adjustmentispossible.
Clock Loses or Gains Time
1.Lossofpowertothermostat. The thermostat will maintain its program in memory
even with no power but the clock time will be incorrect
whenpowerisrestored.SeeNoHeat/NoCool/NoFan
(commonproblems)aboveforitemstocheckinthe
system.
Heat or Cool Starts Early
1.EMRactivated. SeeCongurationMenu(Item3)
Thermostat Does Not Follow
Program
1.AMorPMsetincorrectlyinprogram.
2. AM or PM set incorrectly on the clock.
3.Voltagespikeorstaticdischarge.
4.See“HeatorCoolStartsEarly”above.
Check current clock and program settings including
the AM or PM designations for each time period. If a
voltage spike or static discharge occurs use the Reset
Operation listed above.
Blank Display and/or Keypad Not
Responding
1.VoltageSpikeorStaticDischarge. If a voltage spike or static discharge occurs use the
Reset Operation listed above.