Internal Communication Error Of The Outdoor Unit C-Box - Samsung AM009FN1DCH/AA Service Manual

Troubleshooting

4-4-26 Internal Communication error of the Outdoor Unit C-Box

Outdoor unit display
Indoorunit display
Judgment Method
Cause of problem
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?
4-52
×(Operation) (Reservation)
· Communication error between the C-Box PCB
· Communication wire inside the C-Box is unconnected
· Main PCB defective
Yes
Yes
Yes
Yes
Replace Main PCB
(Blast) ×(Filter) ×(Defrost)
No
Two Comp. applied to the model
No
No
No
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.
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.
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.
Samsung Electronics