Internal Communication Error Of The Outdoor Unit C-Box - Samsung AM072FXVAFH series Service Manual

Troubleshooting

4-4-6 Internal Communication error of the Outdoor Unit C-Box

Outdoor unit display
Indoorunit display
Judgment Method ∙ Communication error between the C-Box PCB
∙ Communication wire inside the C-Box is unconnected
Cause of problem
∙ Main PCB defective
1. How to check
Is the jumper connector connected to
CN31 of Inverter PCB2(when the Comp. applied
one : Inverter PCB1)?
Is Inverter PCB1 CN32 and Inverter PCB2
CN31 connector accurately connected?
PCB1 CN32 and Fan PCB CN12 connector
accurately connected?
Does FAN PCB LD22/LD32 (LED) blink?
Replace Main PCB
4-34
- All boards of outdoor unit are not communicating
Duct, Cassette (1/2 Way),Console, Celing
Operation Defrost Timer Fan
× × ◑ ◑
※ ● : ON ◑ : Flash × : OFF
Yes
Yes
Is Inverter
Yes
Yes
Cassette (4/Mini4 Way)
Filter/MPI Operation Defrost Timer
× ◑ ◑
×
No
Two Comp. applied to the model
No
No
No
Wall-mounted (NeoForte)
Filter Operation Timer Turbo
× × ◑ ◑
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