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Troubleshooting - Mitsubishi Electric EHST20C-VM6HB Service Manual

Split-type, air to water heat pump
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11

TROUBLESHOOTING

11-1. 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.
OCH533D
Check code
Judge what is wrong and take a corrective action according to
Displayed
"11-2. SELF-DIAGNOSIS ACTION TABLE".
Conduct troubleshooting and ascertain the cause of the
Not displayed
trouble.
1 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 trouble occurred,
Logged
matters related to wiring, etc.
2 Reset check code logs and restart the unit after finishing
service.
3 There is no abnormality in electrical component, controller
board, etc.
1 Re-check the abnormal symptom.
2 Conduct troubleshooting and ascertain the cause of the
trouble.
Not logged
3 Continue to operate unit for the time being if the cause is
not ascertained.
4 There is no abnormality concerning of parts such as
electrical component, controller board, etc.
27
Actions to be taken for service (summary)

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