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14
TROUBLESHOOTING
7
Verifyyourprogram setpointtimeentries. The heatingand
coolingprograms utilizethesamesetpoint times,but have
individual setpointtemperaturesfor theMORN,DAY,EVEand
NIGHT setpoints. See SettingYour EnergySavingProgram
sectionof this manual.
Thermostatprogramhas been temporarilyoverriddenand
programindicatoris flashingin thedisplay. Waittillnext
setpointandthe temporaryoverridewillexpireor change
setpointtemperaturetodesiredcomfortlevel.
Thermostatprogramis inPermanentHold(Vacation)Modeand
HOLDandTEMPis showingin display. Press HOLD button to
releasepermanentholdand returnthe thermostat to normal
programoperation.
Thermostat turns
heating or cooling
system on too often
or not often enough.
Increaseor decreasefirst stage temperaturedifferentialsetting
asappropriateto providethe desiredperformancelevel. See
SettingTemperature DifferentialandResidual CoolingFan
Featuresectionof thismanual.
SYMPTOM POTENTIAL SOLUTION
Thermostat does not
turnon heating or
cooling system.
Check to see if OFFis shownin display. Thisindicatesthatthe
systemis turnedoffat thethermostat. Movethesystem
selectorswitchtothe HEAT or COOLposition. Afterthe
compressor shortcycle protection5-minute periodexpires the
systemshouldstartwithin aminutestime.
Compressor protectionfeaturesmaybe in effectdueto
compressor shortcycle conditions. SeeCompressorProtection
sectionfor full explanationof thisfeature.
HeatPumpmaybe malfunctioning. Review the CHECKstatus
indicatorlighttosee if itislit. If theCHECKstatusindicatorlight
islit,call aprofessionalservicetechnician to confirmheatpump
operationandprovidenecessaryservice. Ifheatingisrequired
youcanslidethe systemswitchto EMER settingwhichwillstart
theEmergency Heat sourcetoprovideheatinguntilthe heat
pumpcanbe serviced.
Thermostat turns on
heating instead of
cooling.
Check thermostat wiringto makesurethatthe heatingand
coolingstagesareconnectedto thecorrectterminalsonthe
wiringterminal block. See InstallationandWiringDiagrams
sectionsof this manual.
Thermostat turns on
cooling instead of
heating.
Check thermostat wiringto makesurethatthe heatingand
coolingstagesareconnectedto thecorrectterminalsonthe
wiringterminal block. See InstallationandWiringDiagrams
sectionsof this manual.
Thermostat will not
follow program
setpoints.
Check currenttimeof day,dayof week programsettings. Make
suretoverifyAM/PMindicatoris accurately displayingdesired
timesettings. SeeSetting CurrentTime of Day and DayofWeek
sectionof this manual.
Check to see if OFFis shownin display. Thisindicatesthatthe
systemis turnedoffat thethermostat. Movethesystem
selectorswitchtothe HEAT or COOLposition. Afterthe
compressor shortcycle protection5-minute periodexpires the
systemshouldstartwithin severalseconds.
15
TROUBLESHOOTING
7
cont.
SYMPTOM POTENTIAL SOLUTION
Thermostat turns on
second (auxiliary)
stageof heating or
cooling too quickly or
not quickly enough.
Increaseor decreasesecond(auxiliary)stage temperature
differentialsetting as appropriateto providethe desired
performancelevel. SeeSettingTemperatureDifferential and
ResidualCooling FanFeature sectionofthis manual.
Low Battery Indicator
is shown in
thermostat display.
Replaceback-up batteriesassoon as possible.
SeeLow Battery Detection and Replacement sectionof this
manual.
OFF is shown in
thermostat display
and heating or
cooling system will
not start.
Thisindicatesthatthe systemis turned off atthethermostat.
Movethesystemselectorswitchtothe HEAT or COOLposition.
After the compressorshortcycleprotection 5-minuteperiod
expiresthe systemshouldstart withinseveralseconds.
Thermostat display
is blank.
Itis possiblethatACpoweris notpresentatthe thermostatand
theback-up batteriesarefullydischarged.Check fuse,circuit
breakerand thermostat wiringas appropriatetoverifyACpower
isavailable. Replace back-upbatteriesbeforere-programming
thermostattomakesureyou haveback-up power. SeeLow
Battery DetectionandReplacementandSettingYourEnergy
Saving Programsectionsof thismanual.
IfACPower is present,calla professionalservicetechnician to
verifythermostatand system performance.
Thermostat will not
allowme to program
a setpoint
temperature higher
than90˚ F (32˚ C).
Thisisabovethe normalthermostattemperaturesetting range
of45˚ to 90˚F (7˚ to 32˚ C).
HI is shown in the
thermostat display
where the room
temperature is
normallydisplayed.
Thetemperaturesensed by the thermostat is higherthanthe
99˚F (37˚C) upperlimitof thethermostatsdisplay range. The
displaywillreturnto normalafterthesensedtemperature
lowers withinthe 40˚ to99˚ F(5˚to37˚ C)displayrange. Turnon
thecooling systemor use othermethodsto lowerthe
temperature accordingly.
Thisconditioncouldoccur from the systembeing turnedoff
duringan exceptionallywarmperiodor upon installationwhen
thethermostathasbeenstoredfora longperiodof time in a
warmvehicle or locationprior to beinginstalled. Thethermostat
isequipped with amechanicalhightemperaturesafetyswitch
thatwillturnoff the system shouldthe temperatureexceed99˚
F(37˚ C).