Mini Split Compressor Not Kicking On? Troubleshooting Tips and Fixes for Common Causes

When the compressor in your mini-split system fails to kick on, it can result in a lack of cooling or heating, causing discomfort in your living space. Understanding the potential reasons behind this issue and knowing how to troubleshoot and resolve them can help you restore the proper functionality of your mini-split. In this article, we will explore common causes for a mini-split compressor not kicking on, provide step-by-step solutions, and shed light on why this problem occurs in the first place.

Mini Split Compressor Not Kicking On? Troubleshooting Tips and Fixes for Common Causes
  1. Insufficient Power Supply: A common reason for a compressor not kicking on is an insufficient power supply. Check if the mini-split unit is receiving power by ensuring the circuit breaker is not tripped and the electrical connections are secure. If the breaker has tripped, reset it and monitor if the compressor starts functioning.
  2. Thermostat Malfunction: A faulty thermostat can prevent the compressor from turning on. Check the thermostat settings to ensure it is set to the desired temperature and mode. Consider replacing the batteries in the thermostat and verifying proper programming or calibration.
  3. Refrigerant Leak: Low refrigerant levels due to a refrigerant leak can cause the compressor to malfunction or not engage. A professional HVAC technician should be contacted to identify and repair any refrigerant leaks and recharge the system to the appropriate levels.
  4. Faulty Capacitor: The capacitor is responsible for providing the initial electrical jolt to start the compressor. A faulty or damaged capacitor can hinder the compressor from kicking on. Have a qualified technician examine and replace the capacitor if necessary.
  5. Defective Compressor Motor: If the compressor motor itself is faulty or damaged, it may not engage. In this case, it is advisable to contact a professional technician to assess the motor and determine if repair or replacement is required.
  6. Malfunctioning Control Board: Issues with the control board, which controls various functions of the mini-split system, can prevent the compressor from operating. A trained technician can diagnose and repair control board malfunctions.

Why It Happens: The failure of a mini-split compressor to kick on can be caused by various factors, including electrical problems, thermostat malfunctions, refrigerant leaks, faulty components, or control board issues. These problems can occur due to normal wear and tear, improper installation, lack of maintenance, or system malfunctions.

Head on over to to get the best tools you need to help you around your home!

A mini-split compressor not kicking on can disrupt the comfort and functionality of your cooling or heating system. By following the troubleshooting tips outlined in this article, you can address common causes for this issue and potentially resolve the problem. However, it is important to exercise caution and prioritize safety when troubleshooting or repairing any electrical components. If you encounter complex issues or are unsure about performing the necessary fixes, it is recommended to consult a professional HVAC technician. They possess the expertise to diagnose and repair mini-split systems, ensuring the compressor operates efficiently and provides the desired cooling or heating for your space.

As an Amazon Associate we earn from qualifying purchases through some links in our articles.