The answer to 'mini split not working' is that there could be several common causes, such as a refrigerant leak, electrical issues, or a problem with the compressor or indoor unit. Symptoms may include the system not turning on, poor airflow, or inadequate cooling. Solutions can range from simple DIY fixes like cleaning the filters to more complex repairs that require a professional HVAC technician.
If the mini split is not turning on at all, it could be an issue with the power supply or a tripped circuit breaker. You can try resetting the breaker or checking the wiring and connections. If the system is running but not cooling properly, it may need a refrigerant recharge or have a more serious problem like a compressor failure that requires professional repair.