Troubleshooting - Mitsubishi Electric Mr.Slim PLY-P18BA.TH Service Manual

9

TROUBLESHOOTING

9-1. TROUBLESHOOTING
<Check code display by self-diagnosis and actions to be taken for service (summary)>
Present and past check codes are logged and displayed on the wired remote controller or controller board of outdoor unit.
Actions to be taken for service and the trouble reoccurrence at field are summarized in the table below. Check the contents
below before investigating details.
Unit conditions at service
The trouble is reoccurring.
The trouble is not reoccurring.
OCH551A
Check code Actions to be taken for service (summary)
Judge what is wrong and take a corrective action
Displayed
according to "9-3. SELF-DIAGNOSIS ACTION TABLE" .
Identify the cause of the trouble and take a corrective
Not displayed action according to "9-3. TROUBLESHOOTING OF
PROBLEMS".
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, and wiring related.
Logged
2Reset check code logs and restart the unit after finishing
service.
3There is no abnormality in electrical components,
controller boards, and remote controller.
1Recheck the abnormal symptom.
2Identify the cause of the trouble and take a corrective
action according to "9-4. TROUBLESHOOTING OF
PROBLEMS".
Not logged
3Continue to operate unit for the time being if the cause
is not ascertained.
4There is no abnormality in electrical components,
controller boards, remote controller, etc.
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