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Check code
Rotational frequency of outdoor fan motor trouble
4400
Abnormal points and detection methods
Abnormal if no rotational frequency is detected, or detected a value
outside the specified range during fan motor operation.
●Diagnosis of defectives
Make sure to turn the power OFF before connecting/disconnecting any connectors, or replacing boards.
Check the fuse on the outdoor multi
controller circuit board.
Is the fuse melting?
Check the fan motor connector (CNF1 and
CNF2) for a disconnection or looseness.
Is there any abnormality such
as a disconnection, looseness or
breakage?
Remove the fan motor by disconnecting the fan motor
connector CNF1 and CNF2, then check the voltage of
outdoor multi controller circuit board
"Test points are;
V
approx. 310 to 350 V DC (fan connector 1-4)
DC
V
approx. 15 V DC (fan connector 5-4)"
CC
Is the voltage normal?
OCH576
Diagnosis
(melting)
No
(Not melting)
No
Yes
Causes and check points
Malfunction of fan motor
Disconnection of CNF connector
Defective outdoor multi controller circuit board
• Replace the outdoor multi controller circuit board.
Yes
• Replace the fan motor.
Connect the wiring/connector properly.
Yes
Replace it in case of a breakage.
Replace the outdoor multi controller circuit
No
board.
79
Remedy
Replace the fan motor.
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