Mitsubishi PUY-A12NHA6 - Page 37

37
Check code
Abnormal point and detection method
Case
Judgment and action
U8
(4400)
Outdoor fan motor
Abnormaliftherotationalfrequencyoffan
motorisnotdetectedduringDCfanmotor
operation.
Fanmotorrotationalfrequencyisabnor-
malif;
•100rpmorbelowdetectedcontinuously
for15secondsat68˚F[20:]ormore
outsideairtemperature.
•50rpmorbelowor1500rpmormore
detectedcontinuouslyfor1minute.
1Failureintheoperationofthe
DCfanmotor
2Failureintheoutdoorcircuit
controllerboard
1CheckorreplaceDCfanmotor.
2Checkthevoltageoftheoutdoorcircuit
controllerboardduringoperation.
3Replaceoutdoorcontrollercircuitboard.
(whenthefailureisstillindicatedeven
afterperformingtheaction1above.)
U9
(4220)
Tofindoutthedetailhistory(latest)aboutU9error,turnONSW2-1,2-2and2-6.
Referto"10-10.FUNCTIONOFSWITCHES,CONNECTORSANDJUMPERS".
1Checkthefieldfacilityforthepowersupply.
2Correctthewiring(U
.
V
.
Wphase)to
compressor.
Referto"10-9.TESTPOINT
DIAGRAM"(Outdoorpowercircuitboard).
3Replaceoutdoorpowercircuitboard.
4Checkcompressorforelectricalinsulation.
Replacecompressor.
1Decreaseinpowersource
voltage,instantaneousstop.
2Disconnectionorloose
connectionofCN52Conthe
outdoorpowercircuitboard/
controllercircuitboard
3Defectiveconverterdrivecircuit
inoutdoorpowercircuitboard
4Defective52Cdrivecircuitin
outdoorpowercircuitboard
5Disconnectionorloose
connectionofCN2onthe
outdoorpowercircuitboard/
controllercircuitboard
6PowercircuitfailureonDC
supplyfor18VDCoutputon
outdoorcontrollercircuitboard
04
Input current sensor error/
L1-phase open error
•Decreaseininputcurrent
throughoutdoorunitto0.1A
onlyifoperationfrequencyis
morethanorequalto40Hz
orcompressorcurrentismore
thanorequalto6A.
1Defectiveinputcurrentdetection
circuitinoutdoorpowercircuit
board
2Defectiveoutdoorcontroller
circuitboard
1Replaceoutdoorpowercircuitboard.
2Replaceoutdoorcontrollercircuitboard.
Detailed
codes
01
Overvoltage error
•IncreaseinDCbusvoltageto
A12,18,24N:420V
A30,36,42N:400V
1Abnormalincreaseinpower
sourcevoltage
2Disconnectionofcompressor
wiring
3Defectiveoutdoorpowercircuit
board
4Compressorhasagroundfault.
02
Undervoltage error
•InstantaneousdecreaseinDC
busvoltageto200V
1Checkthefieldfacilityforthepowersupply.
2CheckCN52Cwiring.
3Replaceoutdoorpowercircuitboard.
4Replaceoutdoorpowercircuitboard.
5CheckCN2wiring.
6Replaceoutdoorcontrollercircuitboard.
08
Abnormal power synchronous
signal
•Noinputofpowersynchronous
signaltopowercircuitboard
•Powersynchronoussignal
of44Hzorless,or65Hzor
moreisdetectedonpower
circuitboard.
1Disconnectionorloose
connectionofearthwiring
2Defectivepowersynchronous
signalcircuitinoutdoor
controllercircuitboard
3Defectivepowersynchronous
signalcircuitinoutdoorpower
circuitboard
1Checkearthwiring.
2Replaceoutdoorcontrollercircuitboard.
3Replaceoutdoorpowercircuitboard.
10
PFC error (Overvoltage/
Undervoltage/Overcurrent)
(A12–24N only)
•PFCdetectedanyofthefol-
lowing:
a)IncreaseofDCbusvoltage
to420V.
b)DecreaseinPFCcontrol
voltageto12VDCorlower.
c)Increaseininputcurrentto
47Apeak.
1Distortionofpowersource
voltage,noisesuperimposition
2Disconnectionorloose
connectionofCN2ontheoutdoor
powercircuitboard/controller
circuitboard
3DefectivePFCmoduleofoutdoor
powercircuitboard

1Checkthefieldfacilityforthepower
supply.
2CheckCN2wiring.
3Replace
outdoorpowercircuitboard.
OCH577A