Troubleshooting; Check Point Under Test Run; Before Test Run - Mitsubishi Electric Mr.Slim PUH-P25VGAA Service Manual

10

TROUBLESHOOTING

10-1. TROUBLESHOOTING
<Error code display by self-diagnosis and actions to be taken for service (summary)>
Present and past error codes are logged and displayed on the wired remote controller and control board of outdoor unit.
Actions to be taken for service, which depends on whether or not the inferior phenomenon is reoccurring at service, are sum-
marized in the table below. Check the contents below before investigating details.
Unit conditions at service
The inferior phenomenon is
reoccurring.
The inferior phenomenon is
not reoccurring.

10-2. CHECK POINT UNDER TEST RUN

(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 500V Merger and
check that it is 1.0M" or over.
wDon't use 500V Merger 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 twelve hours before test run in order to protect compressor.
• For specific models which requires higher ceiling settings or auto-recovery feature from power failure, make proper changes
of settings referring to the description of "Selection of Functions through Remote Controller".
Make sure to read operation manual before test run. (Especially items to secure safety.)
Error code
Judge what is wrong and take a corrective action according
Displayed
to "10-4. Self-diagnosis action table".
Conduct trouble shooting and ascertain the cause of the
Not displayed
inferior phenomenon according to "10-5. Troubleshooting
by inferior phenomena".
1Consider the temporary defects such as the work of
protection devices in the refrigerant circuit including
compressor, poor connection of wiring, noise and etc.
Re-check the symptom, and check the installation
environment, refrigerant amount, weather when the
inferior phenomenon occurred, matters related to wiring
Logged
and etc.
2Reset error code logs and restart the unit after finishing
service.
3There is no abnormality concerning of parts such as
electrical component, controller board, remote controller
and etc.
1Re-check the abnormal symptom.
2Conduct trouble shooting and ascertain the cause of the
inferior phenomenon according to "10-5. Troubleshooting
by inferior phenomena".
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
and etc.
30
Actions to be taken for service (summary)