Daikin indoor unit is running but cooling is weak or insufficient, no error code displayed

Safety first: Turn off power before cleaning filters or coils. Do not handle refrigerant yourself.

User steps:

• Clean the indoor air filters thoroughly with water and mild detergent; dry completely before reinstalling.
• Vacuum or gently brush the indoor coil fins to remove dust.
• Clean the outdoor coil with low-pressure water from inside to outside, ensuring the unit is powered off and protected from water entering electrical compartments.
• Ensure all doors and windows are closed and that the room size matches the Daikin unit's capacity.

When to call a technician:

• If performance remains poor after cleaning, a technician should check refrigerant charge, expansion valve operation, and system pressures.