Internal Communication Error Of The Outdoor Unit C-Box - Samsung AM045NN4DEH Series Service Manual

Troubleshooting

4-4-28 Internal Communication error of the Outdoor Unit C-Box

Outdoor unit display
Indoor unit display
Criteria ∙ Communication error between the C-Box PCB
∙ Communication wire inside the C-Box is unconnected
Cause of problem
∙ Main PCB defective
1. Cause of problem
Did the Communication connector
break away from the PCB?
Is Inverter PCB1 CN32 and Inverter PCB
CN31 connector accurately connected?
Is Inverter PCB1 CN32 and Fan PCB
CN12 connector accurately connected?
Confirm a blinking of Fan PCB LD22, 32?
Replace Main PCB
76
Operation
Two Comp. applied to the model
Yes
Yes
Yes
Yes
Timer
Restart operation after connecting the Inverter
No PCB2 CN31(when the Comp. applied one :
Inverter PCB1) connector. (Check the 3, 4 Pin short)
* Service after turn off the Main Power.
Restart operation after checking the Inverter
PCB2 CN31 and PCB2 CN32 Communication
No
* Service after turn off the Main Power.
1) Check the Inverter PCB1 CN32, CN91 and Fan
PCB CN12 Communication wire/Connector.
No
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
No
inspection
2) Check the Hub PCB : Hub PCB TX circuit
inspection
* Service after turn off the Main Power.
wire/Connector.(3, 4 Pin Short)
Samsung Electronics