Nordictrack 18 watt MultiFit controller is currently unavailable.

Although you can purchase the NordicTrack 48 Watt Controller 442297 which will be compatible for your machine

See NordicTrack 48 Watt controller 442297 

https://fitnessdoctor.com.au/products/nordictrack-controller-442297-48-watt?_pos=12&_sid=5553f5c8c&_ss=r

New NordicTrack Treadmill 18 watt MultiFit controller.  MC2100-ELS18W

This controller will suit most NordicTrack treadmills that do not run a touch screen. 

Please note this controller does not come with warranty unless fit by a Authorised iFIT Fitness Repairer- let us help email us on info@fitnessdoctor.com.au