The answer to 'how to fix condenser' is to first check the condenser unit outside your home. Make sure the condenser fan is running and that the coils are clean and free of debris. If the fan is not running or the coils are dirty, you may need to clean or repair the condenser. This involves turning off power to the unit, removing the protective grille, and using a condenser coil cleaner and soft brush to remove any dirt or debris. Be sure to also check the electrical connections and controls to ensure they are in good working order.
If the condenser still isn't functioning properly after cleaning, you may need to call a professional HVAC technician to diagnose and repair any issues with the compressor, refrigerant, or other internal components.