E123
Samsung
Indoor Pipe (Liquid Line) Temperature Sensor Error
E123 displayed; unit may shut down prematurely or 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
Defective pipe thermistor, Poor contact between sensor and refrigerant pipe, Wiring harness damage, Indoor PCB fault
How to Fix / Troubleshooting
Safety warning: Do not cut or open refrigerant pipes. Only adjust or replace the sensor and its clip.
- Step 1 – Locate pipe sensor: With power OFF and front cover removed, locate the thermistor clipped to a copper pipe near the indoor coil.
- Step 2 – Ensure firm contact: The sensor must be tightly clipped to the pipe with insulation wrapped over it. Re-secure the clip and re-wrap insulation if loose.
- Step 3 – Inspect harness: Check for damaged insulation or pulled connectors.
- Step 4 – Replace sensor: If the sensor is cracked or corroded, replace it with a Samsung pipe thermistor specified for your model.
- Step 5 – Test operation: Restore power and run the unit. If E123 remains, an indoor PCB issue is likely and requires professional service.
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Repair Difficulty
Medium
3/5
Required Part
Indoor Pipe Temperature Sensor
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