Hi I know The problem is the Console not the speed sensor in this case ;-(
That part needs to be replaced. I have seen too many of these.
But its easy to do and I will help you if you need me?
Its easy to change out and maybe depending how old your Treadmill is they may cover the cost in whole or in part.
I would try Nordic Track by calling them from the phone # ***** on the warranty card and the user manual if you need anything further please ask me;-)
In any case, I will stick with you until this is complete.
Please rate kindly thus far, it won't cost you anything to rate my service to you kindly,
There is NO cost to rate Kindly;-)
But it is the only way I am credited for my time and expertise in this field.
Then you can reach me by simply replying to this message anytime.
Thank you and have a nice day!