This morning I had the blinking problem at 13 degrees. I've had it few times before on cold mornings.

I was thinking that this is caused by an over current draw by the resistive heaters. When too cold they draw too much current, when up to a reasonable temperature all is okay. Usually your butt heats the seat up enough in a few minutes that it works normally.

I thought that each blink was an actual current pulse to the heater. Having this in mind, I decided to hold the button down to see what would happen.

As I held the high heat button down, I saw that each pulse got a little bit longer. Heaters warming up, resistance going up, current going down? After 25 to 30 pules it stayed on.