No resistance change or erratic or continuous resistance change. Resistance is too hard or too weak. Horizon Fitness Updated July 12, 2021 16:45 RESOLUTION: POWER SUPPLY Verify the power supply and make sure that the adapter is the correct voltage. Verify which program is being used; preset programs will change resistance automatically. Was this article helpful? Yes No 0 out of 0 found this helpful Have more questions? Submit a request Related articles Running belt is loose, drifting or slipping. Comments 0 comments Please sign in to leave a comment.