Samsung AM072FXVAFH series Service Manual page 121

Main PCB has no power phenomenon (cont.)
✳✳
AM038/048/055KXWD
Outdoor unit display
Main PCB has no power phenomenon (7-seg does not blink)
Judgment Method Water Hub PCB power and connection wire to detect.
1) Water Hub PCB connector wire defects and the connection is not.
2) Main PCB defective.
Cause of problem
3) High pressure switch operation
4) Water Hub PCB defective.
1. How to check
Is high pressure switch normal?
Is Water Hub PCB CN102 connected by AC220V?
Were Main PCB CN101 and Water Hub PCB
CN102 connected correctly?
Replace Main PCB
Samsung Electronics
Power On
Yes
Yes
Yes
Yes
No
Refrigerant overcharge?
High pressure switch is defective.
No
Check the connection status of EMI PCB.
Check the short circuit of EMI PCB Fuse.
No
Check the Main PCB and Water Hub
Troubleshooting
PCB power wire.
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