Aprilaire 61000652C 8400 Tstat Thermostat User Manual


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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
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