E103
Samsung
Outdoor Unit Communication or Power Supply Error
Unit does not cool; indoor fan may run; E103 displayed on indoor unit.
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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
No power to outdoor unit, Faulty outdoor PCB power section, Damaged communication cable, Blown outdoor unit fuse
How to Fix / Troubleshooting
Safety first: Outdoor units contain high-voltage components. Turn OFF the outdoor disconnect and main breaker before inspection.
- Step 1 – Check outdoor power:
- Verify the outdoor disconnect switch is ON.
- Check the dedicated breaker in the electrical panel; reset if tripped.
- Step 2 – Listen for outdoor operation: With power restored and a cooling call active, listen near the outdoor unit. If the fan and compressor do not start at all, suspect power or PCB issues.
- Step 3 – Inspect wiring: Remove the outdoor service panel and visually inspect the terminal block and communication wiring. Tighten any loose connections.
- Step 4 – Check for blown fuses (visual only): Some Samsung outdoor PCBs have onboard fuses. If a fuse appears blown or blackened, do not bypass it; this indicates a deeper fault.
- When to call a technician: Measuring voltages and replacing outdoor PCBs or fuses should be done by a qualified HVAC technician due to shock and arc-flash risk.
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Repair Difficulty
Hard
4/5
Required Part
Outdoor Unit PCB
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