Hi there!
L5 sometimes may refer to LS(Low Speed). There might be a problem with your motor sensor. It is best to call the place where you purchased this device for possible replacement if a reboot will not suffice.
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You might be able to get it if you search for Sears online. they closed most stores but have a web site. If they do not help you, you might be able to get the board fixed by a competent electronic repair person.
That's not a Sears part number. Look for a plate on the motor housing. There will be three number, a dot, and several more numbers.
Then go to https://www.searspartsdirect.com/ , enter your model number and open the parts breakdown. The manual is usually near the end of the parts list, often there's no related part number associated.
LS Computer doesn't read the single 8 seconds from the speed sensor The gap between speed sensor & magnet is too far. Adjust it to be within 5mm.
Clean and vacuum inside unit and around senor, check connector is solid and no fray or rubbing on wires.
If the sensor is damaged and caused short circuit. Replace a new speed sensor cable.
If you wish to get some details about treadmill repair and service ; visit the site linked here. Pull up older posts.
http://electro-medical.blogspot.com/
If you wish to get some details about treadmill repair and service ; visit the site linked here. Pull up older posts.
http://electro-medical.blogspot.com/