System shows CH38 and will not cool or heat properly.

Safety: Do not attempt to handle refrigerant yourself. Turn off power if abnormal noises or frost buildup occur.

Homeowner checks:

• Inspect line set: Look for obvious kinks, crushed sections, or mechanical damage to the insulated copper lines between indoor and outdoor units.
• Look for oil stains: Check flare joints and service valves for oily residue indicating leaks.
• Clean coils and filters: Ensure both indoor and outdoor heat exchangers are clean to avoid misdiagnosis.

Technician required: A licensed technician must recover, weigh, and recharge refrigerant to LG specifications, repair any leaks, and verify that piping length and configuration meet design requirements.