I had the same error message E1 at 10 seconds according to the LCD display on an older Treadclimber TC1000. I called Bowflex 1-800-792-6784 and first thing they told me was to check the drive sensor on the back left corner of machine. It is two wires connected by 2 white connectors that snap together. The end of the sensor has a rubber cap that is supposed to be approximately 1/8 inch from the drive pulley. The rubber cap plugs into a small hole within the "firewall" of the drive pulley, but the end of the cap does not actually touch anything. They can email you a picture of it. If it ever gets knocked loose, the machine will register this e1 error, in some cases- hope this helps.
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