1) Dirty air filter: clean the air filter
2) Airflow obstruction: remove obstructions (curtains, sofas ...).
3) Open environment: close open doors or windows
4) Thermostat incorrectly positioned / adjusted: correctly adjust the thermostat according to the instructions in this manual.
5) The device has not been properly sized for the environment: define the model of the device for the environment again, and properly.
6) Existence of some heat source in the environment (cooling): eliminate the heat source from the environment.
