Mitsubishi PUY-A18NHA6 - Page 40

40
Check code
Abnormal point and detection method
Judgment and action
E9
(6841)
Indoor/outdoor unit communication
error (Transmitting error) (Outdoor unit)
(1)Abnormalif“0”receivingisdetected30
timescontinuouslythoughoutdoorcon-
trollercircuitboardhastransmitted“1”.
(2)Abnormalifoutdoorcontrollercircuit
boardcouldnotfindblankoftransmission
pathfor3minutes.
1Indoor/outdoorunitconnecting
wirehascontactfailure.
2Defectivecommunicationcircuit
ofoutdoorcontrollercircuitboard
3Noisehasenteredpowersupply.
4Noisehasenteredindoor/out-
doorunitconnectingwire.
1Checkdisconnectionorloosenessofindoor/
outdoorunitconnectingwire.
2–4 Turnthepoweroff,andonagainto
check.Replaceoutdoorcontrollercircuit
boardifabnormalityisdisplayedagain.
EF
(6607
or
6608)
Non defined check code
Thiscodeisdisplayedwhennondefined
checkcodeisreceived.
1Noisehasenteredtransmission
wireofremotecontroller.
2Noisehasenteredindoor/out-
doorunitconnectingwire.
3Outdoorunitisnotapower-
invertermodels.
12Turnthepoweroff,andonagaintocheck.
 Replaceindoorcontrollerboardoroutdoor
controllercircuitboardifabnormalityis
displayedagain.
3Replaceoutdoorunitwithpower-invertertype
outdoorunit.
Case
Ed
(0403)
Serial communication error
1.Abnormalifserialcommunication
betweenoutdoorcontrollercircuitboard
andoutdoorpowercircuitboardis
defective.
1Breakingofwireorcontact
failureofconnectorCN2
betweentheoutdoorcontroller
circuitboardandtheoutdoor
powercircuitboard
2Breakingofwireorcontact
failureofconnectorCN4
betweentheoutdoorcontroller
circuitboardandtheoutdoor
powercircuitboard
3Defectivecommunicationcircuit
ofoutdoorpowercircuitboard
4Defectivecommunicationcircuit
ofoutdoorcontrollercircuitboard
foroutdoorpowercircuitboard
12CheckconnectionofeachconnectorCN2
andCN4betweentheoutdoorcontroller
circuitboardandtheoutdoorpowercircuit
board.
3Replaceoutdoorpowercircuitboard.
4Replaceoutdoorcontrollercircuitboard.
1Breakingofwireorcontact
failureofconnectorbetween
outdoorcontrollercircuitboard
andM-NETboard
2ContactfailureofM-NETboard
powersupplyline
3NoisehasenteredintoM-NET
transmissionwire.
2.Abnormalifcommunicationbetween
outdoorcontrollercircuitboardand
M-NETboardisnotavailable.
1 Checkdisconnection,looseness,orbreaking
ofconnectionwirebetweenoutdoorcontrol-
lercircuitboard(CNMNT)andM-NETboard
(CN5).
2Checkdisconnection,looseness,orbreaking
ofconnectionwirebetweenoutdoorcontrol-
lercircuitboard(CNMNT)andM-NETboard
(CND).
3CheckM-NETtransmissionwiringmethod.
E8
(6840)
Indoor/outdoor unit communication
error (Signal receiving error)
(Outdoor unit)
(1)Abnormalifoutdoorcontrollercircuit
boardcouldnotreceiveanythingnor-
mallyfor3minutes.
1Contactfailureofindoor/out-
doorunitconnectingwire
2Defectivecommunicationcircuit
ofoutdoorcontrollercircuitboard
3Defectivecommunicationcircuit
ofindoorcontrollerboard
4Noisehasenteredintoindoor/
outdoorunitconnectingwire.
1Checkdisconnectionorloosenessofindoor/
outdoorunitconnectingwireofindoororout-
doorunits.
2–4 Turnthepoweroff,andonagainto
check.Replaceindoorcontrollerboardor
outdoorcontrollercircuitboardifabnormal-
ityisdisplayedagain.
OCH577A