Troubleshooting
Samsung Electronics
4-69
4-4-26 Internal Communication error of the Outdoor Unit C-Box
1. Cause of problem
Replace Main PCB
Restart operation after connecting the Inverter
PCB2 CN31(when the Comp. applied one :
Inverter PCB1) connector. (Check the 3, 4 Pin short)
* Service after turn off the Main Power.
No
Yes
Did the Communication connector
break away from the PCB?
Restart operation after checking the Inverter
PCB2 CN31 and PCB2 CN32 Communication
wire/Connector.(3, 4 Pin Short)
* Service after turn off the Main Power.
No
Yes
Yes
Is Inverter PCB1 CN32 and Inverter PCB
CN31 connector accurately connected?
1) Check the Inverter PCB1 CN32, CN91 and Fan
PCB CN12 Communication wire/Connector.
2) Restart operation after connecting the Hub PCB
CN97 and Fan PCB CN13 connector.
* Service after turn off the Main Power.
1) Check the Main PCB : Main PCB TX circuit
inspection
2) Check the Hub PCB : Hub PCB TX circuit
inspection
* Service after turn off the Main Power.
No
No
Yes
Is Inverter PCB1 CN32 and Fan PCB
CN12 connector accurately connected?
Confirm a blinking of Fan PCB LD22, 32?
Two Comp. applied to the model
Outdoor unit display
Indoor unit display
×(Operation)
ስ
(Reservation)
ስ
(Blast) ×(Filter) ×(Defrost)
Judgment Method
∙ Communication error between the C-Box PCB
Cause of problem
∙ Communication wire inside the C-Box is unconnected
∙ Main PCB defective
