Mitsubishi EHST20D-YM9C User Manual

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TROUBLESHOOTING
10
10-1. Troubleshooting
<Summary of self diagnosis based on Error Codes and Service Procedures>
PresentandpastErrorcodesareloggedanddisplayedonthemainremotecontrollerorcontrolboardoftheoutdoorunit.
Pleaserefertothetablebelowandsubsequentexplanationstodiagnoseandremedytypicalproblemsthatmayoccurintheeld.
Unit Condition Error Code Action
Reoccurringproblem
Displayed Usetable"10-4.Selfdiagnosisandaction"toidentifyfaultandcorrect.
Not Displayed Usetable"10-5.Troubleshootingbyinferiorphenomena"toidentifyfaultandcorrect.
Nonreoccurringproblem Logged 1.Checktemporarycausesofdefectssuchastheoperationofsafetydevicesontherefrigerant/water
circuitincludingcompressor,poorwiring,electricalnoise,etc.Re-checkthesymptomandtheinstal-
lationenvironment,refrigerantamount(Splitsystemsonly),weatherconditionsattimeoffault,etc.
2.ResetErrorcodelogs,Servicetheunitandrestartsystem.
NotLogged
1. Recheck the abnormal symptom
2.Identify cause ofproblemandtakecorrectiveactionaccordingtoTable"10-5.Troubleshootingby
inferiorphenomena".
3. If no obvious problem can be found continue to operate the unit.
NOTE
Electricalcomponentsshouldonlybereplacedasanaloption.Pleasefollowinstructionsin"10-4.Selfdiagnosisandaction"and"10-5.Troubleshoot-
ing by inferior phenomena" fully before resorting to replacing parts.
10-2. Test Run
Before a test run
•Afterinstallationofoutdoorunit,pipeworkandelectricalwiring,recheckthatthereisnowaterleakage,loosenedconnectionsormiswiring.
•Measureimpedance betweenthegroundand thepowersupplyterminal block(L,N)onthe outdoorandindoorunits withsuitable(500V)ohmmeter.Resistance
shouldbe≥1.0MΩ.
•ReadtheInstallationandOperationManualsfullyespeciallythesafetyrequirementsbeforecarryingoutanytestruns.
10-3. Malfunction diagnosis method by main remote controller
Ifduringstartuporoperationamalfunctionoccurstheerrorcodescreenmaybedisplayedonthemainremotecontroller.
Theerrorcodescreenshowsthefollowing;code,unit,ref.address,andtelephonenumberofinstaller(onlyifpreviouslyenteredbytheinstaller)
Pleasenoteinthecaseofsomemalfunctionsanerrorcodeisnotgeneratedpleaserefertotable"10-5.Troubleshootingbyinferiorphenomena"formoredetails.
To reset
1. To reset the main remote controller press F4 button (Reset).
2.ThenpressF3(Yes)toconrm.
OCH570C

Mitsubishi EHST20D-YM9C Specifications

General

Brand	Mitsubishi
Model	EHST20D-YM9C
Category	Heat Pump
Language	English