The answer to 'why is my ductless system short cycling' is that there are several common causes, including issues with the thermostat, refrigerant leaks, compressor problems, or dirty air filters. Short cycling occurs when the system turns on and off rapidly, which can lead to increased wear and tear and higher energy bills.
Some common symptoms of short cycling include the system not reaching the desired temperature, frequent on/off cycles, and uneven cooling or heating throughout the home. To troubleshoot, you'll want to check the thermostat settings, inspect the refrigerant lines for leaks, and clean or replace the air filters. If the issue persists, it's best to call in a professional HVAC technician to diagnose and repair the problem.