10
b)
Cut off the power supply and rotate the fan blade by hand. If it can’t rotate smoothly, check if
there is any block. Otherwise, go to next step.
c)
Check the wiring of fan motor.
d)
Measure the voltage of fan motor from PCB. If the parameters are normal, replace a new fan motor.
If not, replace indoor unit PCB.
Note:
DC fan motor voltage: Measure the voltage when the unit is in standby.
No.
Color
Signal
Voltage
1
Red
Vdc
150~340V
2
--
--
3
Black
GND
0V
4
White
Vcc
14~17.5V
5
Yellow
Vsp
0~5.6V
6
Blue
FG
14~17.5V
AC fan motor voltage: Power on and set the unit running in fan mode at high fan speed. After
running for 15 seconds, measure the voltage of red and black wire. If the value of the voltage
is less than 100V (208~240V power supply), the PCB must has problems and need to be
replaced.
2
.4.6 E9 (IDU) Communication fault of wired controller
Troubleshooting and repair:
a)
Check the connection between wired controller and indoor PCB.
b)
Change another wired controller.
c)
Change a new indoor PCB.
2
.4.7 HC Room card port disconnected port
Possible reason:
Short circuit is not connected in CN2 port
