Troubleshooting - Mitsubishi Electric PUZ-HA24NHA1 Service Manual

10

TROUBLESHOOTING

10-1. 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.
OCH750A
Check code
Judge the problem and take a corrective action according
to "10-3. SELF-DIAGNOSIS ACTION TABLE".
Displayed
Conduct troubleshooting and ascertain the cause of the
trouble according to "10-4. TROUBLESHOOTING BY
INFERIOR PHENOMENA".
Not displayed
1. C onsider 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. R eset check code logs and restart the unit after finishing
service.
3. T here is no abnormality in electrical component, controller
board, remote controller, etc.
1. R e-check the abnormal symptom.
2. C onduct troubleshooting and ascertain the cause of the
trouble according to "10-4. TROUBLESHOOTING BY
INFERIOR PHENOMENA".
3. C ontinue to operate unit for the time being if the cause is
Not logged
not ascertained.
4. T here is no abnormality concerning of parts such as
electrical component, controller board, remote controller,
etc.
26
Actions to be taken for service (summary)