Carrier 53DFS250-HW - Temporary Hold

53DFS250-HW
11
69-2565—05
Troubleshooting
Symptom Possible Cause Action
Displaydoesnotcome
on.
Thermostatisnotbeing
powered.
Checkfor24VacbetweenCandR.CheckthatAA
batteriesareinstalledcorrectlyandaregood.
Temperaturesettings
donotchange.
Theupperorlowertemperature
limitswerereached.
Checktemperaturesetpoints.CheckInstallerSetup
Numbers0600and0610;modifyasneeded.
Thekeypadisfullylocked. CheckInstallerSetupNumber0670tochange
keypadlockedoptions.
Heatingorcooling
doesnotcomeon.
Thermostatminimumoff-timeis
activated.
Waituptofiveminutesforthesystemtorespond.
SystemselectionnotsettoHeat
orCool.
SetsystemSelectiontocorrectposition.
SystemtypeSelectionis
incorrect.
CheckInstallerSetupNumber0170andmakesure
correctSystemtypeischosen.
Heatdoesnotturnon
(HeatOnissolidinthe
display).
Heatingequipmentfailure. Checkfor24Vacattheequipmentonthesecondary
sideofthetransformerbetweenpowerand
common.Ifvoltageisnotpresent,checktheheating
equipmenttofindthecauseoftheproblem.
Checkfor24Vacbetweentheheatterminal(Yand
H2)andtransformercommon.If24Vacispresent,
thethermostatisfunctional.Checktheheating
equipmenttofindthecauseoftheproblem.
Looseorbrokenwire
connectionbetweenthermostat
andheatingequipment.
Checkfor24Vacbetweentheheatterminal(Y
andH2)andtransformercommon.Ifvoltageisnot
present,checkwireconnection(looseorbroken)
betweenthethermostatandtheheatingequipment.
Coolingdoesnotturn
on(CoolOnissolidin
thedisplay).
Coolingequipmentfailure. Checkfor24Vacattheequipmentonthesecondary
sideofthetransformerbetweenpowerand
common.Ifvoltageisnotpresent,checkthecooling
equipmenttofindthecauseoftheproblem.
Checkfor24Vacbetweenthecoolterminal(Y)
andtransformercommon.If24Vacispresent,
thethermostatisfunctional.Checkthecooling
equipmenttofindthecauseoftheproblem.
Looseorbrokenwire
connectionbetweenthermostat
andcoolingequipment.
Checkfor24Vacbetweenthecoolterminal(Y)
andtransformercommon.Ifvoltageisnotpresent,
checkthewireconnection(looseorbroken)
betweenthethermostatandthecoolingequipment.
HeatOnisnotinthe
display.
Systemsettingisnotset
toHeatand/ortemperature
settingisnotsetaboveroom
temperature.
SetthesystemsettingtoHeatandsetthe
temperaturesettingabovetheroomtemperature.
CoolOnisnotinthe
display.
Systemsettingisnotsetto
Cooland/orthetemperature
settingisnotsetbelowroom
temperature.
SetthesystemsettingtoCoolandsetthe
temperaturesettingbelowtheroomtemperature.
Waitisinthedisplay. Compressorminimumofftimer
isactive.
Waituptofiveminutesforthecoolingorheating
(heatpump)equipmenttoturnon.