How to Replace the Upper Board and Reed Switch on a Treadmill Horizon Fitness Updated August 26, 2021 17:11 Please see the attached PDF for instructions on how to replace the Upper Board and Reed Switch on your Horizon Treadmill. For assistance, please call 888.878.9011 or email firstname.lastname@example.org. To order replacement parts, visit parts.horizonfitness.com or email email@example.com. Replacing Upper Board-Reed Switch on a Treadmill.pdf200 KB Was this article helpful? Yes No 0 out of 0 found this helpful Have more questions? Submit a request Related articles How to Replace the Touchpad on a Treadmill How Do I Remove A Treadmill Motor Cover? How to Replace the Lock Latch on a Treadmill How to Fix a Safety Key Off Message on a Treadmill How to Fix a Treadmill that is Stopping and Starting Comments 0 comments Article is closed for comments.