E9 (Idu) Communication Fault Of Wired Controller; Hc Room Card Port Disconnected Port - Omega OTEC IEWB Series Service Manual

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.
 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
No. Color
1 Red
2 --
3 Black
4 White
5 Yellow
6 Blue
Signal Voltage
Vdc 150~340V
--
GND 0V
Vcc 14~17.5V
Vsp 0~5.6V
FG 14~17.5V
10