9.3.1.3 Zero-crossing signal error
Check if the connections and
power supply is normal?
Correct the connections. Turn on the
unit when the power supply is good.
No
Yes
Indoor PCB is defective.
Replace indoor PCB.
9.3.1.4 Indoor fan speed has been out of control (DC fan motor)
Shut off the power supply and
turn it on 1 minute later. Is it
still displaying the error code?
Shut off the power supply,
rotate the fan by hand. Does
it rotate properly?
The unit operates normally.
Replace indoor fan
motor.
Check the wires of fan motor.
Are all the connections good?
No
Yes
No
Correct the connections.
No
Yes
Replace indoor main PCB. Is it
still displaying the error code?
Yes
Yes
Check the voltage between port
1 and 6 of fan motor connector,
is it 310V?
No
DC motor voltage input and output
NO.
Color
Signal
Voltage
1
Red
Vs/Vm
280V~380V
2
---
---
---
3
Black
GND
0V
4
White
Vcc
14-17.5V
5
Yellow
Vsp
0~5.6V
6
Blue
FG
14-17.5V
