Mitsubishi PUZ-A18NHA6 - Page 34

34
Check code
Abnormal point and detection method
Judgment and action
Eb
(6845)
Miswiring of indoor/outdoor unit
connecting wire (converse wiring or
disconnection)
Outdoorcontrollercircuitboardcan
automaticallysettheunitnumberofindoor
units.
Abnormaliftheindoorunitnumbercan-
notbesetwithin4minutesafterpoweron
becauseofmiswiring(conversewiringor
disconnection)ofindoor/outdoorunitcon-
nectingwire.
EC
(6846)
Start-up time over
Theunitcannotfinishstart-upprocess
within4minutesafterpoweron.
Case
1Contactfailureofindoor/
outdoorunitconnectingwire
2Diameterorlengthofindoor/
outdoorunitconnectingwireis
outofspecifiedcapacity.
72ormoreoutdoorunitshave
refrigerantaddress“0”.
 (Incaseofgroupcontrol)
8Noisehasenteredintopower
supplyorindoor/outdoorunit
connectingwire.
1Contactfailureormiswiringof
indoor/outdoorunitconnecting
wire
2Diameterorlengthofindoor/
outdoorunitconnectingwireis
outofspecifiedcapacity.
4Defectivetransmittingreceiving
circuitofoutdoorcontrollercircuit
board
5Defectivetransmittingreceiving
circuitofindoorcontrollerboard
6Defectiveindoorpowerboard
72ormoreoutdoorunitshave
refrigerantaddress“0”.
(Incaseofgroupcontrol)
8Noisehasenteredintopower
supplyorindoor/outdoorunit
connectingwire.
Miswiring of indoor/outdoor unit
connecting wire
1.Outdoorcontrollercircuitboardcan
automaticallycheckthenumberof
connectedindoorunits.Abnormalifthe
numbercannotbecheckedautomatically
duetomiswiringofindoor/outdoorunit
connectingwire,etc.afterpoweris
turnedonfor4minutes.
2.Abnormalifoutdoorcontrollercircuit
boardrecognizesexcessivenumberof
indoorunits.
1Checkdisconnectionorloosenessorpolarity
ofindoor/outdoorunitconnectingwireof
indoorandoutdoorunits.
2Checkdiameterandlengthofindoor/outdoor
unitconnectingwire.
Totalwiringlength:262ft[80m]
(includingwiringconnectingeachindoorunit
andbetweenindoorandoutdoorunit)
Alsocheckiftheconnectionorderofflat
cableisS1,S2,S3.
3Checkthenumberofindoorunitsthatare
connectedtooneoutdoorunit.(IfEAis
detected)
4–6Turnthepoweroffonce,andonagainto
check.
Replaceoutdoorcontrollercircuitboard,
indoorcontrollerboardorindoorpower
boardifabnormalityoccursagain.
7Checkifrefrigerantaddresses(SW1-3to
SW1-6onoutdoorcontrollercircuitboard)are
overlappingincaseofgroupcontrolsystem.
8Checktransmissionpath,andremovethe
cause.
Note:Thedescriptionsabove,1–8,arefor
EA,EbandEC.
1Contactfailureormiswiringof
indoor/outdoorunitconnecting
wire
2Diameterorlengthofindoor/
outdoorunitconnectingwireis
outofspecifiedcapacity.
3Excessivenumberofindoor
unitsareconnectedto1indoor
unit.(4unitsormore)
4Defectivetransmittingreceiving
circuitofoutdoorcontroller
circuitboard
5Defectivetransmittingreceiving
circuitofindoorcontrollerboard
6Defectiveindoorpowerboard
72ormoreoutdoorunitshave
refrigerantaddress“0”.
(Incaseofgroupcontrol)
8Noisehasenteredintopower
supplyorindoor/outdoorunit
connectingwire.
EA
(6844)
F5
(5201)
63H connector open
Abnormalif63Hconnectorcircuitisopenfor
3minutescontinuouslyafterpowersupply.
63H:High-pressureswitch
1Disconnectionorcontactfailure
of63Hconnectoronoutdoor
controllercircuitboard
2Disconnectionorcontactfailure
of63H
363Hisworkingduetodefective
parts.
4Defectiveoutdoorcontroller
circuitboard
1Checkconnectionof63Hconnectoron
outdoorcontrollercircuitboard.
Referto"10-9.TESTPOINTDIAGRAM".
2Checkthe63Hsideofconnectingwire.
3Checkcontinuitybytester.
Replacethepartsifthepartsaredefective.
4Replaceoutdoorcontrollercircuitboard.
OCH577A