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.