Mitsubishi PUZ-A18NHA6 - Page 42

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A6
(6606)
Communication error with communica-
tion processor
Defectivecommunicationbetweenunit
processorandtransmissionprocessor
Note:Theaddressandattributedisplayat
remotecontrollerindicatethecon-
trollerthatdetectedabnormality.
1Dataoftransmissionproces-
sororunitprocessorisnot
transmittednormallybecause
ofaccidentaltroublesuchas
noiseorlightningsurge.
2Addressforwardingfromunit
processorisnottransmitted
normallybecauseofdefective
transmissionprocessorhard-
ware.
Turnoffthepowersupplyofoutdoorunitand
indoorunitandFRESHMASTERorLOSSNAY
atthesametimefor2minutesormore,and
turnthepoweronagain.Systemreturnsto
normalifabnormalitywasaccidentalmalfunc-
tion.Ifthesameabnormalitygeneratesagain,
abnormality-generatedcontrollermaybedefec-
tive.
Check code Abnormal point and detection method Case Judgment and action
A7
(6607)
NO ACK signal
1.Transmittingsidecontrollerdetects
abnormalifamassagewastransmitted
butthereisnoreply(ACK)thatames-
sagewasreceived.Transmittingside
detectsabnormalityevery30seconds,6
timescontinuously.
Note:Theaddressandattributedisplayed
atremotecontrollerisindicatethe
controllerthatdidnotreply(ACK).
Commonfactorthathasnorela-
tionwithabnormalitysource.
1Theunitofformeraddress
doesnotexistasaddress
switchhaschangedwhilethe
unitwasenergized.
2Extinctionoftransmissionwire
voltageandsignaliscausedby
over-rangetransmissionwire.
•Maximumdistance······ 656ft
[200m]
•
Remotecontrollerline
. .
(39ft
[12m])
3Extinctionoftransmissionwire
voltageandsignaliscausedby
type-unmatchedtransmission
wire.
Type······
Withshieldwire-
 CVVS,CPEVS
Withnormalwire(noshield)-
 VCTF,VCTFK,CVV
 CVS,VVR,VVF,VCT
Diameter····1.25mm
2
[AWG16]
ormore
4Extinctionoftransmissionwire
voltageandsignaliscaused
byover-numberedunits.
5Accidentalmalfunctionof
abnormality-detectedcontroller
(noise,lightningsurge)
6Defectiveofabnormalitygen-
eratedcontroller
2.Ifdisplayedaddressorattributeisout-
doorunit,Indoorunitdetectsabnormality
whenindoorunittransmittedtooutdoor
unitandtherewasnoreply(ACK).
1Contactfailureoftransmission
wireofoutdoorunitorindoor
unit
2Disconnectionoftransmission
connector(CN2M)ofoutdoor
unit
3Defectivetransmittingreceiving
circuitofoutdoorunitorindoor
unit
Always try the followings when the error
“A7” occurs.
1Turnoffthepowersupplyofoutdoorunit
andindoorunitandFRESHMASTERor
LOSSNAYatthesametimefor2minutesor
more,andturnthepoweronagain.Ifmal-
functionwasaccidental,theunitreturnsto
normal.
2Checkaddressswitchofabnormalitygener-
atedaddress.
3Checkdisconnectionorloosenessofabnor-
malitygeneratedorabnormalitydetected
transmissionwire(terminalblockandcon-
nector)
4Checkiftolerancerangeoftransmissionwire
isnotexceeded.
5Checkiftypeoftransmissionwireiscorrect
ornot.
Ifthecauseoftroubleisin1–5above,repair
thedefective,thenturnoffthepowersupply
ofoutdoorunitandindoorunitandFRESH
MASTERorLOSSNAYatthesametimefor2
minutesormore,andturnthepoweronagain.
•Ifthecauseoftroubleisnotin1–5abovein
singlerefrigerantsystem(oneoutdoorunit),
controllerofdisplayedaddressorattributeis
defective.
•Ifthecauseoftroubleisnotin1–5abovein
differentrefrigerantsystem(2ormoreoutdoor
units),judgewith6.
6Ifaddressofabnormalitysourceisthe
addressthatshouldnotexist,thereisthe
unitthatmemorizesnonexistentaddress
information.Deleteuselessaddressinforma-
tionwithmanualsettingfunctionofremote
controller.
 OnlythesystemFRESHMASTERor
LOSSNAYareconnectedto,orthesystem
thatisequippedwithgroupsettingofdiffer-
entrefrigerantsystem.
Ifthecauseoftroubleisnotanyof1–6
above,replacethecontrollerboardofdisplayed
addressorattribute.
Iftheunitdoesnotreturntonormal,multi-con-
trollerboardofoutdoorunitmaybedefective
(repeatercircuit).
Replacemulti-controllerboardonebyoneto
checkiftheunitreturnstonormal.
3.Ifdisplayedaddressorattributeisindoor
unit,remotecontrollerdetectsabnormal-
itywhenremotecontrollertransmittedto
indoorunitandtherewasnoreply(ACK).
1Duringgroupoperationwith
indoorunitofmulti-refrigerant
system,ifremotecontroller
transmittoindoorunitwhile
outdoorunitpowersupply
ofonerefrigerantsystemis
turnedofforwithin2min-
utesofrestart,abnormalityis
detected.
2Contactfailureoftransmission
wireofremotecontrolleror
indoorunit
3Disconnectionoftransmission
connector(CN2M)ofindoor
unit
4Defectivetransmittingreceiving
circuitofindoorunitorremote
controller
OCH577A