NordicTrack 5100R Treadmill Motor Control Board Model Number NTTL18512 Part Number 183552

Ditto on the review above with a couple of suggestions. Instead of using a screwdriver for the calibration I found a 5/64 Hex worked great, I tried a bunch of screwdrivers and all were either too big or too small. The board installs to the mounting plate with industrial velcro which is fine, I would just suggest that you don't actually install it until you finish the calibration. The compartment is a tight space and having the board loose was helpful. Finally, the downloaded instructions included a diagram that for some reason would not display properly, but the text instructions were clear enough to get through the install.

It was fairly easy to replace even though it is not exactly like the original. Just make sure you go through ALL of the calibration steps. I have been using mine for a couple weeks and there have been no issues.