CH25
LG Low-Pressure Protection (Refrigerant System Underpressure)

System shows CH25 and stops cooling or heating.

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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

Refrigerant leak in indoor or outdoor coil or line set, Restricted expansion device, Severely dirty indoor coil reducing refrigerant flow, Incorrect refrigerant charge after service

How to Fix / Troubleshooting

Safety: Do not attempt to add or remove refrigerant yourself. Refrigerant handling requires EPA-certified technicians.

Homeowner checks:

  • Clean indoor filters and coil: Remove and wash filters. If the indoor coil is visibly dirty, gently vacuum or have it professionally cleaned.
  • Inspect for oil stains: Look around flare joints, service valves, and coil connections for oily residue, which can indicate a refrigerant leak.
  • Avoid running the unit: Operating with low refrigerant can damage the compressor. Leave the system off until inspected.

Technician required: A licensed HVAC technician must locate and repair leaks, evacuate the system, and recharge with the correct amount of LG-specified refrigerant. They will also verify that the expansion device and coils are not restricted.

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Repair Difficulty

Professional Required 5/5

Required Part

Refrigerant Line Set
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