Si18-201 Troubleshooting - Outdoor Unit Related
Service Diagnosis 289
3.3.26 Transmission Error between Microcomputers
Outdoor Unit
Indication
LC
Method of
Malfunction
Detection
Malfunction
Decision
Conditions
When the transmission error with INV fan microcomputer continues for 60 seconds
Supposed
Causes
"
Faulty fan PC board
"
Outside causes (noise, etc.)
Troubleshooting
Could be outside causes
(noise, etc.)
Replace control PC board.
Is the error
re-generated when turning
the power supply
on again?
(MF045)
YES
NO
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Note: If the error should be caused by wiring connection, etc., fan transmission error (U7) is generated,
immediately replace the control PC board.
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