Troubleshooting - Mitsubishi Electric PLA-ZM35EA2 Service Manual

9

TROUBLESHOOTING

9-1. 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 or controller board of out-
door unit. Actions to be taken for service, which depends on whether or not the trouble is reoccurring in the field, are summa-
rized in the table below. Check the contents below before investigating details.
Unit conditions at service
The trouble is reoccurring.
The trouble is not reoccurring.
9-2. MALFUNCTION-DIAGNOSIS METHOD BY REMOTE CONTROLLER
Refer to "13-8. SELF-DIAGNOSIS" to search for the error history.
OCH777A
Check code
Judge what is wrong and take a corrective action according
Displayed
to "9-3. SELF-DIAGNOSIS ACTION TABLE".
Conduct troubleshooting and ascertain the cause of the
Not displayed trouble according to "9-4. TROUBLESHOOTING
OF PROBLEMS".
1 Consider 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
Logged
trouble occurred, matters related to wiring, etc.
2 Reset check code logs and restart the unit after finishing
service.
3 There is no abnormality in electrical component,
controller board, remote controller, etc.
1 Re-check the abnormal symptom.
2 Conduct troubleshooting and ascertain the cause of
the trouble according to "9-4. TROUBLESHOOTING
OF PROBLEMS".
Not logged
3 Continue to operate unit for the time being if the cause
is not ascertained.
4 There is no abnormality concerning of parts such as
electrical component, controller board, remote controller, etc.
17
Actions to be taken for service (summary)