Samsung AM072/096/120/144FXVAFH, Service Manual

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Troubleshooting
Samsung Electronics 4-35
Internal communication error of the outdoor unit C-Box
(cont.)
Two Comp. applied to the model
غ
AM038/048/055KXWD
✳✳
1. How to check
Replace Main PCB
Restart after confirming connector connection
of Water Hub PCB CN303 and terminal connector
(Check the 3, 4 Pin short circuit)
Yes
Did the communication connector
break away from the PCB?
Restart after connecting the Main PCB CN301 and
Water Hub PCB CN302 communication wire.
Yes
Yes
Is Main PCB CN301 and Water Hub PCB CN302
connector accurately connected?
Restart after connecting the Main PCB CN305 and
Inverter PCB CN351 communication wire.
No
No
No
Is LED151 of Inverter PCB blinking?
Outdoor unit display
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 18 ℃ 21 ℃ Timer 24 ℃ 27 ℃
× × ◑ ◑
×
× ◑ ◑ × × × ◑ ◑ ×
※ ● : 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.