Mitsubishi PUZ-A18NHA6 - Page 45

45
Phenomena
Factor
Countermeasure
7.Remotecontrollerdisplayworks
normallyandtheunitperformsheat-
ingoperation,however,thecapacity
cannotbefullyobtained.
1Linearexpansionvalvefault
Openingcannotbeadjustedwellduetolinear
expansionvalvefault.
2Refrigerantshortage
3Lackofinsulationforrefrigerantpiping
4Filterclogging
5Heatexchangerclogging
6Airductshortcycle
7Bypasscircuitofoutdoorunitfault
1 Dischargingtemperatureandindoorheat
exchangertemperaturedoesnotrise.
 Inspectthefailurebycheckingdischarging
pressure.
 Replacelinearexpansionvalve.
2 Ifrefrigerantleaks,dischargingtempera-
turerisesandLEVopeningincreases.
 Inspectleakagebycheckingthetempera-
tureandopening.
 Checkpipeconnectionsforgasleakage.
3 Checktheinsulation.
4 Openintakegrillandcheckthefilter.Clean
thefilterbyremovingdirtordustonit.
5 Ifthefilterisclogged,indoorpipetem-
peraturerisesanddischargingpressure
increases.Checkifheatexchangeris
cloggedbyinspectingdischargingpres-
sure.
 Cleantheheatexchanger.
6 Removetheblockage.
7 Checkrefrigerantsystemduringoperation.
8.1For3minutesaftertemperature
adjusterturnsoff,thecompressor
willnotstartoperatingevenif
temperatureadjusteristurnedon.
2For3minutesaftertemperature
adjusterturnson,thecompressor
willnotstopoperatingevenif
temperatureadjusteristurnedoff.
(Compressorstopsoperating
immediatelywhenturningoffby
theremotecontroller.)
12Normaloperation
(Forprotectionofcompressor)
12Normaloperation
4.EvencontrollingbytheIRwireless
remotecontrollernobeepisheard
andtheunitdoesnotstartoperat-
ing.Operationdisplayisindicated
onIRwirelessremotecontroller.
1ThepairnumbersettingsoftheIRwireless
remotecontrollerandindoorcontrollerboardare
mismatched.
1Checkthepairnumbersettings.
5.WhenoperatingbytheIRwireless
remotecontroller,beepsoundis
heard,however,unitdoesnotstart
operating.
1Nooperationfor2minutesatmostafterthepower
supplyON.
2Hand-heldremotecontrolleroperationisprohibited.
•RemotecontrollingadaptorisconnectedtoCN32
ontheindoorcontrollerboard.
•Hand-heldremotecontrolleroperationisprohibited
bycentralizedcontrolleretc.sinceitisconnectedto
MELANS.
3RefertofactorofphenomenaNo.2onprevious
page.
1Normaloperation
2Normaloperation
3CheckthedetailsofphenomenaNo.2on
previouspage.
6.Remotecontrollerdisplayworks
normallyandtheunitperformscool-
ingoperation,however,thecapacity
cannotbefullyobtained.(Theair
doesnotcoolwell.)
1Refrigerantshortage
2Filterclogging
3Heatexchangerclogging
4Airductshortcycle
1 Ifrefrigerantleaks,discharging
temperaturerisesandLEVopening
increases.
 Inspectleakagebycheckingthe
temperatureandopening.
 Checkpipeconnectionsforgasleakage.
2 Openintakegrilleandcheckthefilter.
Cleanthefilterbyremovingdirtordust
onit.
3 Ifthefilterisclogged,indoorpipe
temperaturerisesanddischarging
pressureincreases.Checkifheat
exchangeriscloggedbyinspecting
dischargingpressure.
 Cleantheheatexchanger.
4 Removetheblockage.
OCH577A