26
TROUblESHOOTINg
COOlINg SYSTEm DOES NOT RESpOND
(“COOlINg” AppEARS ON SCREEN)
•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coolingterminal(Y)
andthetransformercommon.If24VACispresent,
thethermostatisfunctional.Checkthecooling
systemtofindthecauseoftheproblem.
•Checkforlooseorbrokenwiresbetweenthe
thermostatandthecoolingequipment.
fAN DOES NOT TURN ON IN A CAll fOR HEAT
•CheckSystemSetting#02(FanControl),tomake
sure the fan control is properly set to match the type
of system (see page 11).
HEAT pUmp ISSUES COOl AIR IN HEAT mODE,
OR wARm AIR IN COOl mODE
•CheckSystemSetting#12(ReversingValve),tomake
sure it is properly configured for your system (see
page 11).
HEAT/COOl bOTH ON AT SAmE TImE
•CheckSW1(EquipmentType),tomakesureitisset
tomatchtheinstalledheating/coolingequipment
(see page 12).
•Checktomakesureheatingandcoolingwiresare
not shorted together.
HEATINg EQUIpmENT IS RUNNINg IN
COOl mODE
•CheckSW1(EquipmentType),tomakesureitisset
tomatchtheinstalledheating/coolingequipment
(see page 12).
“HEATINg” IS NOT DISplAYED
•ChangetheSystemModetoHeat,andset
thetemperaturelevelabovethecurrentroom
temperature.
“COOlINg” IS NOT DISplAYED
•ChangetheSystemModetoCool,andset
thetemperaturelevelbelowthecurrentroom
temperature.
61000652C 8400 Tstat Install.indd 26 10/13/09 11:09:03 AM