Midea M-Thermal Series - Page 48

  M‐ThermalSplit 
20190947
Procedure

E3/E4/H2/H3/Ed/HA/H5/H9 


Temperaturesensorconnectionon
hydronicboxmainPCBisloose
Yes
Ensurethesensorisconnectedproperly
No

Temperaturesensorhasshort‐circuited
orfailed
2

Yes
Replacethesensor
No

ReplacehydronicboxmainPCB   

Notes: 
1. Backupelectric heaterwateroutlettemperaturesensor,
 watersideheat exchangerrefrigerantinlet(liquidpipe) temperaturesensor,watersideheat
exchangerrefrigerantoutlet (gaspipe) temperaturesensor,watersideheatexchangerwaterinlettemperaturesensorandwater sideheatexchanger
wateroutlettemperaturesensorconnectionsareportCN6onthehydronicboxmainPCB(labeled11inFigure4‐2.1inPart4,2.2"MainPCBforHydronic
System").
 DomestichotwatertanktemperaturesensorconnectionisportCN13onthehydronicboxmainPCB(labeled12inFigure4‐2.1inPart4,2.2
"MainPCBforHydronicSystem").Circuit2wateroutlettemperaturesensorconnectionisportCN15onthehydronicboxmainPCB(labeled13inFigure
4‐2.1inPart4,2.2"MainPCBforHydronicSystem").RoomtemperaturesensorconnectionisportCN16onthehydronicboxmainPCB(labeled14inFigure
4‐2.1inPart4,2.2"MainPCBforHydronicSystem").
2. Measuresensor resistance.If the resistanceis toolow, the sensorhasshort‐circuited.Iftheresistanceisnotconsistentwith thesensor’s resistance
characteristicstable,thesensorhasfailed.RefertoTable4‐5.1or4‐5.3inPart4,5.1“TemperatureSensorResistanceCharacteristics”.
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