Troubleshooting
4-22
Samsung Electronics
4-3-6 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
Is the jumper connector connected to CN31 of
Inverter PCB2(when the Comp. applied one :
Inverter PCB1)?
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 PCB2
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?
Does FAN PCB LD22/LD32 (LED) blink?
Two Comp. applied to the model
Outdoor unit
display
- All boards of outdoor unit are not communicating
Indoorunit
display
Duct, Cassette (1/2 Way),Console, Celing
Cassette (4/Mini4 Way)
Wall-mounted (NeoForte)
Operation
Defrost
Timer
Fan
Filter/MPI Operation Defrost
Timer
Filter Operation
Timer
Turbo
×
×
◑
◑
×
×
◑
◑
×
×
◑
◑
※ ●
: ON
◑
: Flash ×: OFF
Judgment
Method
∙ Communication error between the C-Box PCB
Cause of
problem
∙ Communication wire inside the C-Box is unconnected
∙ Main PCB defective
Summary of Contents for AM080*XV Series
Page 205: ...Samsung Electronics 5 1 5 PCB Diagram and Parts List 5 1 ASS Y PCB MAIN...
Page 208: ...PCB Diagram and Parts List 5 4 Samsung Electronics 5 2 ASS YPCBMAIN HUB AC...
Page 210: ...PCB Diagram and Parts List 5 6 Samsung Electronics ASS YPCBMAIN HUB cont DC...
Page 216: ...PCB Diagram and Parts List 5 12 Samsung Electronics 5 4 ASS YPCBFAN Model 1 FANchassis...
Page 218: ...PCB Diagram and Parts List 5 14 Samsung Electronics ASS YPCBFAN cont Model 2 FAN chassis...
Page 241: ...Cycle Diagram 7 10 Samsung Electronics 7 16 AM240 260 280 300MXVAGC...