What can cause this HVAC problem?
Confirm the remote is in Cool mode and the set temperature is below room temperature. Clean reusable filters only as described in the manufacturer’s manual, and check that the indoor intake and outlet are not blocked. Note any flashing indicator lights or error codes for the technician.
Safe checks homeowners can make
If one indoor head behaves differently from others, the problem may be specific to that zone or its controls. If all heads fail, the outdoor unit or system controls may be involved. Do not remove covers or handle refrigerant. Request ductless mini-split service or AC repair for a diagnosis.
When to arrange professional service
For aging equipment, ask whether repair parts remain available and compare the estimate with replacement. New system planning is covered on AC installation and HVAC installation. Keep the system maintained through AC maintenance, and browse the [Gardena HVAC homepage](/) for related services.
What to ask before approving a repair
Ask the service provider to explain the diagnosis, the work being recommended, the estimate, and any applicable warranty. Share the equipment type and symptoms you observed. Do not attempt electrical, gas, or refrigerant work yourself. Service availability and the work offered should be confirmed directly with the provider.