Mitsubishi Electric PUZ-WZ50VAA Service Manual page 31

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 control 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 is reoccurring.
The trouble is not reoccurring.
OCH816
Check code
Judge what is wrong and take a corrective action according
to "9-2. SELF-DIAGNOSIS ACTION TABLE".
Displayed
Conduct troubleshooting and ascertain the cause of the
trouble according to "9-3. TROUBLESHOOTING OF
PROBLEMS".
Not displayed
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.
Reset check code logs and restart the unit after finishing
service.
There is no abnormality in electrical component,
controller board, remote controller, etc.
Re-check the abnormal symptom.
Conduct troubleshooting and ascertain the cause of the
trouble according to "9-3. TROUBLESHOOTING OF
PROBLEMS".
Continue to operate unit for the time being if the cause
Not logged
is not ascertained.
There is no abnormality concerning of parts such as
electrical component, controller board, remote controller,
etc.
31
Actions to be taken for service (summary)