If you want to contact NordicTrack about redeeming warranty on a faulty machine then you should phone their parent company Icon Health & Fitness who administer and underwrite warranty on all equipment sold by NordicTrack.
You should also contact Icon Health and Fitness if you would like to enquire about purchasing spare parts for any machine sold to you by NordicTrack. The number for spare parts is 0330 123 1045.