1 AC7
Samsung
Communication Error Between Main PCB and UI Board
Dryer displays 1 AC7; may not respond to controls or may not start.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Loose or damaged communication cable, Faulty user interface (display) board, Defective main PCB, Corroded connectors
How to Fix / Troubleshooting
Safety: Disconnect power before opening the control console.
- Access control area: Remove the top cover and then the control panel screws to expose the UI board and main PCB.
- Reseat cables: Disconnect and reconnect the ribbon cable or harness between the UI and main PCB. Ensure connectors are fully seated and locking tabs engaged.
- Inspect for damage: Look for bent pins, corrosion, or cracked solder joints on both boards.
- Test operation: Restore power and test. If the error persists, either the UI board or main PCB may be faulty and should be replaced, typically starting with the UI board.
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Repair Difficulty
Hard
4/5
Required Part
User Interface Board
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