Gree GWH(09)MA-K3DNA2B Service Manual page 44

Troubleshooting
9.2.2 H6 malfunction
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 flow chart below:
" "
H6 is
displayed on
the unit .
Stir the fan blade
with a hand when
the unit is DEEN-
ERGIZED.
Does the blade
Yes
rotate unsmoothly ?
No
No
Is the feedback
Yes
terminal of PG
motor loose?
No
No
Is the control
Yes
terminal of PG
motor loose?
No
No
Re-energize to
measure
turn on the unit;
measure
within 1 turn on the unit;
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 .
Yes
Is the
malfunction
Yes
eliminated?
Replace the fan
Yes
motor .
Is the
malfunction
eliminated?
Yes
End
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