Gree GWH12YD-S6DBA1A Service Manual page 42

Service Manual
2. Malfunction of Blocked Protection of IDU Fan Motor H6
Main detection points:
● SmoothlyIs the control terminal of PG motor connected tightly?
● SmoothlyIs the feedback interface of PG motor connected tightly?
● The fan motor cant operate?
● The motor is broken?
● Detectioncircuit of the mainboard is defined abnormal?
Malfunction diagnosis process:
check whether the wiring terminal
between indoor fan and main
Connect power and restart the unit.
Test whether the voltage between terminal 1 and terminal 2
of motor interface is within 280~310VDC.
Then check whether the voltage
between terminal 2 and terminal 3
of the motor interface is 15VDC.
Then check whether there is voltage
between terminal 2 and terminal 4
of the motor interface.
It's the malfunction of motor.
Replace a new motor that is
of the same model.
Installation and Maintenance
Start
Turn the fan blades
by hand under
power-off condition
Whether the fan blades
can run smoothly?
Yes
No
Under power-off condition,
board is loose.
No No
Yes
Yes
Yes
Adjust the motor and blade
assembly so that rotor can run
No
smoothly.
Turn unit on
to check whether the
malfunction is
eliminated.
Reinsert the wiring
Yes
terminal of indoor fan.
Turn unit on
to check whether the
malfunction is
eliminated.
It's the malfunction of main board.
No
Replace a new main board that is
of the same model.
It's the malfunction of main board.
No
Replace a new main board that is
of the same model.
It's the malfunction of main board.
No
Replace a new main board that is
of the same model.
End
Yes
Yes
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