Troubleshooting - Outdoor Unit Related Si18-201
294 Service Diagnosis
3.3.30 Transmission Error of DC Fan
Outdoor Unit
Indication
U7
Method of
Malfunction
Detection
Malfunction
Decision
Conditions
When transmission error with DC fan microcomputer continued for 60 seconds
Supposed
Causes
"
Incorrect connectors connection
"
DC fan microcomputer malfunction
"
Outside causes (noise, etc.)
"
Malfunction of control PC board receiving circuit
Troubleshooting
Could be outside causes
including noise, etc.
Correct the connection to
restart.
Replace fan PC board.
Is the
error re-generated when
turning the power supply
on again?
(MF050)
YES
NO
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Are DC fan
PC board and control
PC board correctly
connected?
NO
YES
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