Midea M-Thermal Series - Page 80

  M‐ThermalSplit 
20190979
Procedure

Pd 


Airsideheatexchangerrefrigerantoutlet
temperaturesensorisloose
1

Yes
Ensurethetemperaturesensoris
connectedproperly
No

Airsideheatexchangerrefrigerantoutlet
temperaturesensorhasshort‐circuited
orfailed
2

Yes
Replacethetemperaturesensor
No

Theairsideheatexchangerheat
exchangeispoor
3

Yes
Inspectthesystemandfixtheerror
No

Thefanorfanmotorisblockedor
damaged
Yes
Inspectthesystemandfixtheerror
No

ReplaceoutdoormainPCB  

Notes: 
1. AirsideheatexchangerrefrigerantoutlettemperaturesensorandoutdoorambienttemperaturesensorconnectionportareCN9ontheoutdoorunitmain
PCB(labeled12inFigure4‐2.2inPart4,2.3"MainPCBsforRefrigerantSystem,InverterModule")..
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Part2,1.1“OutdoorUnitLayout”andtoTable4‐5.1inPart4,5.1“TemperatureSensorResistance
Characteristics”.
3. Checkairsideheatexchanger,fanandairoutletsfordirt/blockages.

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