Carrier 58MEC instruction manual Troubleshooting Guide TWO-STAGE

TROUBLESHOOTING GUIDE — TWO-STAGE

	NO
START.			circuit	toSTART.
Closedoorswitchandgobackto	Iscircuitbreakerclosed?	YES	Checkforcontinuityinwirefrom breakertofurnace.	Closecircuitbreakerandgoback
NO	NO

	Isdoorswitchclosed?	YES	switch?	YES
			Isthere115Vgoingto		Replacedoorswitch.	Replacetransformer.		REDwirefromthe code. OnREDLED
	L2?andL1at115VthereIs	YES	NO and1-SECat24VthereIsSEC-2?	YES	control.furnaceReplace	voltagelinecorrectforCheckpolarityand twinned,areunitsIfgrounding.checkforproper transformer(24V)voltage-low phasing.		brieflycodestatusrecallToremoveandreconnectone rolloutflameorswitchlimitswitchtodisplaystoredstatus
	NO
	NO					YES		NO
START	IsLEDstatuslighton?	YES				IsLEDstatuslightblinkingrapidly withoutapause?	NO	IsLEDstatuslightblinkingON/OFFslowly

		Checkroomthermostator interconnectingcable.	NO	Is24VpresentatW/W1,W2,Y1,Y/Y2orG thermostatterminalsonthefurnacecontrol?	YES	Disconnectallthethermostatwiresfromthe furnacecontrol.	Doestheproblemrepeatwhenusinga jumperwire?	NO	Thethermostatisnotcompatiblewiththe furnacecontrol.Eitherinstallaballastresistor, connecttheCom24Vthermostatterminalto thethermostat,orreplacethethermostat.
panelaccessblowerorpowerremovenotdocontrolbeforeinitiatingstatus codestatusprevioustherecallalsocanYourecall.codebymomentarily terminalCom24VtoterminalTEST/TWINtheshortinguntiltheLEDgoesout. statusorcodeprevioustheofstatustheflashwillLEDcode#11(1shortand theAftercode.previousnowasthereifflash)long1controlrepeatsthecode		sequence.testcomponentthestartwillcontrolthetimes,4 Onceinitiated inducerThespeed.HEATHIatONturnwillcontrolthewillrunfortheentire speed,HEATLOmotorblowerHSI,Thetest.componentHIHEATspeed,and Gaseach.seconds15–10forrunwillspeedCOOLvalveandhumidifierwill OFFturnedismotorblowertheWhenon.turnedbenot theinducerwillbe seconds.10forspeed-lowtoswitched		NO		Runsystemthroughalow-heat,high-heat, orcoolingcycletocheckoperation. Status codesareerasedafter72hours. OnRED LEDboardsstoredstatuscodescanalsobe erasedwhenever(115Vor24V)isinterrupted.	YES
				othercodestatuspreviousathereWas #11?than	YES		Replacefurnacecontrol.
				Y1,W2,W/W1,torespondcontrolthe signals?thermostat(24V)Gand
				Does Y/Y2,
				NO
				YES
withacombinationofshortandlongflashes?	YES	Determinestatuscode. Thestatuscodeisa 2digitnumberwiththefirstdigitdetermined bythenumberofshortflashesandthesecond digitbythenumberoflongflashes?		Gotosectionbelowforthestatuscodethat wasflashed.

A05111

A05095

58MEC

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