Samsung AM072FXVAFH series Service Manual page 131

Internal communication error of the outdoor unit C-Box
✳✳
AM038/048/055KXWD
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
Did the communication connector
break away from the PCB?
Is Main PCB CN301 and Water Hub PCB CN302
connector accurately connected?
Is LED151 of Inverter PCB blinking?
Samsung Electronics
Duct, Cassette (1/2 Way),Console, Celing
Operation Defrost Timer Fan
× × ◑ ◑
※ ● : ON ◑ : Flash × : OFF
Two Comp. applied to the model
Yes
Yes
Yes
Replace Main PCB
(cont.)
Cassette (4/Mini4 Way)
Filter/MPI Operation Defrost Timer
× ◑ ◑
×
No
No
No
Wall-mounted (NeoForte)
Filter 18℃ 21℃ Timer
× × × ◑
Restart after confirming connector connection
of Water Hub PCB CN303 and terminal connector
(Check the 3, 4 Pin short circuit)
Restart after connecting the Main PCB CN301 and
Water Hub PCB CN302 communication wire.
Restart after connecting the Main PCB CN305 and
Inverter PCB CN351 communication wire.
Troubleshooting
24℃ 27℃
◑ ×
4-35