Troubleshooting - Mitsubishi Electric PUZ-ZM60VHA2 Service Manual

TROUBLESHOOTING

10
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 wired remote controller and control 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.
10-2. CHECKPOINT UNDER TEST RUN
10-2-1. Before test run
• After installation of indoor and outdoor units, piping work and electric wiring work, re-check that there is no refrigerant leak-
age, loosened connections and incorrect polarity.
• Measure impedance between the ground and the power supply terminal block (L, N) on the outdoor unit by 500 V Megger
and check that it is 1.0 MΩ or over.
• Do not use 500 V Megger to indoor/outdoor connecting wire terminal block (S1, S2, S3) and remote controller terminal block
(1, 2). This may cause malfunction.
• Make sure that test run switch (SW4) is set to OFF before turning on power supply.
• Turn on power supply 12 hours before test run in order to protect compressor.
• For specific models which require higher ceiling settings or auto-recovery feature from power failure, make proper changes of
settings referring to the description of "11. FUNCTION SETTING".
Make sure to read operation manual before test run. (Especially items to secure safety.)
10-2-2. TEST RUN
Refer to "15-4. TEST RUN" for operation procedure.
10-2-3. ERROR INFORMATION
Refer to "15-2. ERROR INFORMATION" when an error occurs.
10-2-4. ERROR HISTORY
Refer to "15-6. ERROR HISTORY" to check the errors occurred in the past.
10-2-5. SELF-DIAGNOSIS
Refer to "15-7. SELF-DIAGNOSIS" to search for the error history.
OCH771
Check code
Judge the problem and take a corrective action according
Displayed
to "10-3. SELF-DIAGNOSIS ACTION TABLE".
Conduct troubleshooting and ascertain the cause of the
Not displayed trouble according to "10-4. 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
Logged
trouble occurred, matters related to wiring, etc.
2Reset check code logs and restart the unit after finishing
service.
3There is no abnormality in electrical component,
controller board, remote controller, etc.
1Re-check the abnormal symptom.
2Conduct troubleshooting and ascertain the cause of the
trouble according to "10-4. TROUBLESHOOTING OF
PROBLEMS".
3Continue to operate unit for the time being if the cause
Not logged
is not ascertained.
4There is no abnormality concerning of parts such as
electrical component, controller board, remote controller,
etc.
37
Actions to be taken for service (summary)