Troubleshooting - Mitsubishi Electric MXZ-4C36NAHZ Service Manual

8

TROUBLESHOOTING

8-1. TROUBLESHOOTING
<Check code displayed by self-diagnosis and actions to be taken for service (summary)>
Present and past check codes are logged, and they can be displayed on the wired remote controller and multi controller circuit
board of outdoor unit. Actions to be taken for service, which depends on whether or not the trouble is reoccurring in the field,
are summarized in the table below. Check the contents below before investigating details.
Unit conditions at service
The trouble has reoccurred.
The trouble is not reoccurring.
OCH573
Check code Actions to be taken for service (summary)
Judge what is wrong and take a corrective action according
Displayed
to "8-4. SELF-DIAGNOSIS ACTION BY FLOWCHART".
Conduct troubleshooting and ascertain the cause of the
Not displayed trouble according to "8-5. TROUBLESHOOTING
BY INFERIOR PHENOMENA".
1Consider the temporary defects such as the work of
protection devices in the refrigerant circuit including
compressor, poor connection of wiring, noise, etc.
Re-check the symptom, and check the installation
environment, refrigerant amount, weather when the
trouble occurred, matters related to wiring, etc.
Logged
2Reset check code logs and restart the unit after finishing
service.
3There is no abnormality concerning of parts such as
electrical component, controller board, remote controller,
etc.
1Re-check the abnormal symptom.
2Conduct troubleshooting and ascertain the cause of the
trouble according to "8-5. TROUBLESHOOTING
BY INFERIOR PHENOMENA".
Not logged
3Continue to operate unit for the time being if the cause
is not ascertained.
4There is no abnormality concerning of parts such as
electrical component, controller board, remote controller,
etc.
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