Try this it worked for me. Remove one end of the swivel linkage (pull fuse first) and check for resistance on your steps as you move them independent in the disconnected mode. If you find that they seem to require sufficient force to actuate the steps in their full travel, you need to lubricate all hinge points while continuing to free up movement. What is happening is the controller (small blk box under step) senses resistance beyond design spec and interrupts power to the motor. That occurs before the fuse blows in some cases. After proper movement has been restored, reconnect and you should be good to go. Good luck !
The way to tell if your steps are binding beyond the designed loads, is after you disconnect one end of your linkage, reinsert the fuse and actuate the steps in the screen door /switch mode. That will tell you that your steps are binding, and need lube.
Love the "no lubrication required sticker"!!