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Possible causes:
1. Fan motor is locked;
2. The.feedback.terminal of PG motor is not connected tightly;
3. The control terminal of PG motor is not connected tightly;
4. Motor is damaged;
5. Malfunction of the rotation speed detection circuit of the mainboard.
See the
chart below:
"H6"is
displayed on
the unit.
Stir the fan blade
with a hand when
the unit is DE -
ENERGIZED .
Does the
blade rotate
Yes
unsmoothly?
No
No
Is the
feedback
Yes
terminal of PG
motor loose?
No
No
Is the
control terminal
Yes
of PG motor
loose?
No
No
Re-energize
to turn on the unit;
measure within 1 min after the
louvers are opened whether the output
voltage on the control terminal
of the PG motor is over 50V?
No
No
Mainboard
malfunction ;
Replace it .
Reinstall the motor
and the blade to
make it rotate
smoothly.
Is the
malfunction
eliminated?
Insert the feedback
terminal tightly .
Is the
malfunction
Yes
eliminated?
Insert the control
terminal tightly .
Is the
malfunction
Yes
eliminated?
Replace the fan
Yes
motor.
Is the
malfunction
eliminated?
Yes
End
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