As a parts expert at FitnessRepairParts.com I can answer questions related to replacment parts for your equipment and assist in narrowing down your issue to which part(s) might correct your problem.
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Unfortunately this sounds like it might be a more complex electrical issue. You're probably best to contact a service provider in your area and have them come and diagnose the machine. I've linked below
This does not sound like a commonly encountered problem and it will probably need the help of a professional to troubleshoot the issue. I recommend locating one near you to come take a look at the machine
https://www.fitnessrepairparts.com/part_search/EquipmentSearch/lc9500 Above is a list of equipment that matches the model name you provided. What you're describing could be a loose or worn out crank
Some treadmills are designed to cycle through an incline calibration on power-up. If it is doing this it will incline all the way up, then all the way back down. Other treadmills require that they are
https://www.fitnessrepairparts.com/part_search/EquipmentSearch/%4048%20HealthRider%20S150 The link above is to a few pieces of equipment match the name you provided. There is a good chance that what