Upper Board/Reed Switch Replacement Horizon Fitness Updated July 12, 2021 16:44 Click the link below for instructions on how to replace the Upper Board and Reed Switch on your Horizon Treadmill: https://cdn.horizonfitness.rocks/Forms/Upper%20Board-Reed%20Switch%20Replacement.pdf Was this article helpful? Yes No 0 out of 0 found this helpful Have more questions? Submit a request Related articles Treadmill Lock Latch The display on the treadmill is showing only dashes, 8’s or reads “Safety Key Off.” No resistance change or erratic or continuous resistance change. Resistance is too hard or too weak. Comments 0 comments Article is closed for comments.