Check your owners manual. It will tell you what the blinking means

@detroitwheelin I just call mine Oscar... don't know why

about 20 to 15 degrees (Fahrenheit) is pretty cold for your board. I have had it shut off going slow and have gotten push back when I still have 20%. Just be aware of the temp you're riding at because it will drain your battery faster the colder it is out. Float on!

Its just the motor surging, everything is completely normal. It is just working hard to get you up the hill! Happy Floating!

If you get the TFL Kush pad it has room for a front sensor, but you need to use a V1 sensor not the new sure stance.
https://www.youtube.com/watch?v=RV_3eCLzn_I