Nordictrack 2450 won’t adjust speed when on belt

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in Treadmill Problems
So I picked up a 2015 or so 2450. It seems like a great machine over all. It runs smooth and quiet and seems to be able to hold a constant speed. The problem is it won’t slow down, stop, or speed up when the user is walking or running on the belt. The display shows the new speed but the belt itself won’t change both up or down. I checked the belt tension and it seems reasonable. The belt tracks well. I cleaned and lubed the deck with a treadmill silicone lube and I can move the belt with a little effort with out power.
I can’t wrap my head around why the belt speed will adjust when the user isn’t on the belt but won’t when they are.
What can I check or what is wrong and needs to be replaced.

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