Air conditioner runs but does not cool effectively; air from indoor unit is only slightly cool or room never reaches set temperature.

Safety first: Turn off power before cleaning internal components.

• Step 1 – Clean indoor filters: Remove and wash the Samsung filters with lukewarm water and mild detergent. Dry completely before reinstalling.
• Step 2 – Clean indoor coil: With the front cover and filters removed, gently vacuum the evaporator fins using a soft brush attachment. Do not bend fins.
• Step 3 – Clean outdoor unit: Remove debris around the outdoor unit and clean the condenser fins with low-pressure water.
• Step 4 – Check temperature difference: After 15–20 minutes of operation in COOL mode, measure the air temperature at the indoor intake and outlet. A typical drop is 8–12°C. If the difference is much lower, refrigerant or compressor issues may exist.
• Step 5 – Evaluate room load: Ensure doors/windows are closed and heat sources (ovens, direct sun) are minimized. If the room is larger than the unit's rated capacity, performance will be limited.
• Technician recommended: If cleaning and load reduction do not help, have a technician check refrigerant charge and system pressures.