Diagram 3
Diagram 4
(3) IDU fan motor error（C2）
Main detection points:
SmoothlyIs the control terminal of PG motor connected tightly●
SmoothlyIs the feedback interface of PG motor connected tightly●
● The fan motor can't operate?
● The motor is broken?
● Detection circuit of the mainboard is defined abnorm
Malfunction diagnosis process:
Start
While power is off stir the blade
with a tool to see whether the
blade rotates smoothly
Check if the connection of PG
Check if the connection of PG
Turn on the unit again; measure
whether the output voltage on
control terminal for PG motor is
more than 50V within 1 min after
the louvers are opened
Tighten the screw; reassemble the blade, motor
and shaft bearing rubber base sub-assy to make
sure there is no foreign object between them
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
Is malfunction
eliminated
Is malfunction
eliminated
Is malfunction
eliminated
Is malfunction
eliminated
Is the motor started up
No
Replace PG motor
Replace the mainboard
with the same model
End
Reinstall the blade
and motor correctly
No
Insert the control terminal
of PG motor tightly
(4) Temperature sensor open/short circuit(E0、E1）
Main detection points:
Is the wiring terminal between the temperature sensor and the controller loosened or poorly contacted●
Is there short circuit due to trip-over of the parts●
● Is the temperature sensor broken
Is main board broken?Malfunction diagnosis process●
Is the wiring terminal between the
temperature sensor and the controller
loosened or poorly contacted?
Start
Insert the temperature
sensor tightly
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
Is malfunction
eliminated
Is malfunction
eliminated
Is malfunction
eliminated
Replace it with a
temperature sensor with
the same model
Make the parts upright
Is there short circuit due to trip-
over of the parts
Is the temperature sensor normal
according to the resistance table?
Replace the mainboard with
the same model.
End
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