Just got a unit with my SantaFe dehumidifier. Have wireless sensor in the basement. The unit flashes (light goes on for a second) - don't know exactly the frequency since I didn't time it. Otherwise working fine. Light turns on when I press the button.
We have 2 different versions of this model. You provided us with model 00592W so I will provide instructions for this model. It is one of our older models. We do have a newer model that would have letters or numbers after the W. Make sure you are using a fresh good quality standard alkaline battery such as Rayovac, Energizer, Duracell or Kirkland. Remove the batteries for about 2 minutes and then put them back in. Make sure the button on top of the display is not stuck where it is triggering the backlight to come on. If this doesn't correct the issue you are experiencing we would recommend replacing the weather station.