The cell should produce down to about 52°. Pentair's ICs have an array of lights and a somewhat confusing key as to which light means what, blinking or otherwise. Sometimes indicating one of several things. You'll need the owner manual for your model to dicipher the lights, as some of the functions have evolved with newer models. I believe the model number is on the bottom of the unit.
Or if you post the model number and exactly which light or lights are blinking, someone here might know. "I got the blinking lights." isn't quite enough to go on.
If it's only the five Sanitizer Output LED Indicators blinking, that indicates your 10% setting (produces chlorine for 27 seconds of each 5 minute period).
The other clue is the 2850 salt indicator. As the temperature drops, the IC's ability to measure salt does too. Plus, that measurement is only good to ±500ppm on a good day. Either can trigger its low-salt warning, and/or cold water warning, which might be what you're seeing (though those warnings are a solid red light, not a blinking one, at least on my model). You need a true test of the salt level before you decide to add more. I use the Taylor Salt Test Kit (K-1766) for that.
Some of the lights blink during its initial startup process, too. So you have to wait for a few minutes when you first turn on the SWG for the lights to indicate anything meaningful.