E554
Samsung Refrigerant System Protection (Low or High Pressure)

E554 appears; unit may not start or may shut down quickly.

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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

Low refrigerant charge (leak), Blocked condenser or evaporator, Faulty pressure sensor, Closed service valves

How to Fix / Troubleshooting

Safety warning: Refrigerant is under high pressure and must only be handled by certified technicians.

  • Step 1 – Check airflow: Ensure both indoor and outdoor coils are clean and unobstructed. Clean filters and coils as needed.
  • Step 2 – Verify service valves: If the system is newly installed, confirm that the outdoor service valves are fully open (this is typically done by the installer).
  • Step 3 – Look for oil stains: Oil around flare joints or coils can indicate a refrigerant leak. Do not attempt to tighten flares under pressure.
  • Technician required: Pressure checks, leak detection, and refrigerant charging must be performed by a licensed HVAC technician.
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Repair Difficulty

Professional Required 5/5

Required Part

Refrigerant Pressure Sensor
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