E440
Samsung
Indoor-Outdoor Mismatch or Configuration Error
Indoor unit shows E440; system may not operate.
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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
Incorrect indoor/outdoor combination, Wrong capacity setting on PCB, Incorrect DIP switch configuration, Firmware mismatch after PCB replacement
How to Fix / Troubleshooting
Safety warning: Configuration changes should follow the official Samsung installation manual.
- Step 1 – Verify model pairing: Check that the indoor and outdoor model numbers are listed as compatible in Samsung documentation.
- Step 2 – Check capacity settings: On some models, DIP switches or software parameters must be set to match the capacity (e.g., 9k, 12k BTU). Confirm these settings on both indoor and outdoor PCBs.
- Step 3 – Confirm PCB part numbers: If a board was recently replaced, ensure the part number is correct for your exact model and capacity.
- Step 4 – Power cycle: After correcting settings, power down the entire system for 5–10 minutes, then restart.
- Technician recommended: If E440 persists, a Samsung service technician may need to reprogram or replace the PCB with the correct firmware.
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Repair Difficulty
Hard
4/5
Required Part
Indoor Unit Main PCB
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