Mitsubishi FDUA125VNPWVH - (2) Troubleshooting procedure; (3) Troubleshooting at the indoor unit

'22 • PAC-SM-412
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39
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■ Error log and reset
Error indicator Memorizederrorlog Reset
Remote control display •Higherpriorityerrorismemorized.
•StoptheunitbypressingtheON/OFF
switch of remote control.
•Iftheunithasrecoveredfromanomaly,it
can be operated.
RedLEDonindoorunitcontrolPCB • Not memorized.
■
Resetting the error log
1) RC-EXZ3A
• Resettingthememorizederrorlogintheremotecontrol
Youtouch the buttonsintheorder of “Menu” → “Servicesetting”→ “Service & Maintenance” →“Service
password”→“Errordisplay”→“Errorhistory”ontheTOPscreenofremotecontrol.Andifyoutouch“Delete”
→“Yes”button,allerrorlogandanomalydatamemorizedintheremotecontrolaredeleted.
• Resettingthememorizederrorlogintheindoorunit
Youtouch the buttonsintheorder of “Menu” → “Servicesetting”→ “Service & Maintenance” →“Service
password”→“Errordisplay”→“Erroranomalydata”ontheTOPscreenofremotecontrol.
Theremotecontroltransmitserrorlogerasecommandtotheindoorunitwhen“Yes”buttonispressedontheerase
anomaly data screen.
Receivingthecommand,theindooruniterasethelogandanswerthestatusofnoerror.
2) RC-E5
•Resettingthememorizederrorlogintheremotecontrol
 Holdingdown“CHECK”button,press“TIMER”buttontoresettheerrorlogmemorizedintheremotecontrol.
•Resettingthememorizederrorlogintheindoorunit
 Theremotecontroltransmitserrorlogerasecommandtotheindoorunitwhen“VENTI”buttonispressedwhile
holdingdown“CHECK”button.
 Receivingthecommand,theindooruniterasethelogandanswerthestatusofnoerror.
(2) Troubleshooting procedure
Whenanytroublehasoccurred,inspectasfollows.Detailsofrespectiveinspectionmethodwillbedescribedonlaterpages.
Trouble
Confirmation
of power
source
(Indoor/
outdoor unit)
Confirmation of
remote control and
LEDsonthePCBof
indoor unit (Indoor
unit, remote control)
Check of the anomalous
operation data on the
remote control
Inspection
oftheunit/
control
Replacement/
repair of
faulty part,
test run,
adjustment
(3) Troubleshooting at the indoor unit
Withthetroubleshooting,ndoutanydefectivepartbycheckingthevoltage(AC,DC),resistance,etc.atrespective
connectorsataroundtheindoorunitPCB,accordingtotheinspectiondisplayoroperationstatusofunit(the
compressordoesnotrun,fandoesnotrun,the4-wayvalvedoesnotswitch,etc.),andreplaceorrepairintheunitof
followingpart.
(i) Replacement part related to indoor unit PCB’s
ControlPCB,powersourcePCB,temperaturesensor(returnair,indoorheatexchanger),remotecontrolswitch,limit
switch, transformer and fuse
Note(1)Withregardtopartsofhighvoltagecircuitsandrefrigerationcycle,judgeitaccordingtoordinaryinspectionmethods.