A clicking motor on your Tread Lite Electric Double Steps # LC353543 or # LC353621 is indicative there is an issue with the motor not sensing the proper amperage at the end of the extension cycle, which is what tells it to shut off when it is finished extending.
So the best option is going to be to replace the motor with the Replacement Motor for Lippert Tread Lite Powered RV Steps # LC183058.
I have added a link below to a video review for you to check out as well if you'd like to take... view full answer...
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