What should I do if the fan cannot rotate when connect the chiller to power?

Please check the parameters setting of the chiller, you should make the target temp and temperature difference in certain range that the chiller can work normally. e.g., target temp=65F, d=2, the chiller will keep the water between 65-67F.

Why the chiller cannot cool the water?

First, check the temperature probe, the probe should be put fully into the water. And the cooling effect is closely related to the water volume and room temp, you can tell us your need in detail for further suggestions.

Why the chiller start and stop working at incorret temp, not based on setted temp?

It may be the malfunction of the temperature controller. If this problem occurs, we will resend a new controller for you.