What to Do When Your Ductless AC Needs Repair When your system needs ductless ac repair, here's a quick overview of what to do: Check the basics first - Inspect the air filter, thermostat settings, and circuit breaker before calling a pro. Identify the symptom - Warm air, water leaks, unusual noises, error codes, or short cycling all point to different problems. Turn it off if leaking - If you see water or refrigerant leaking, shut the unit off immediately to prevent further