We have an Eppendorf Concentrator plus complete system, with the included F-45-48-11 rotor. I can't get it to spin, only dessicate (and when it does this it just vibrates slightly, leaving the solid precipitate all along the sides of the sample eppendorf tube walls).

On the 'CEFU' or 'C-' settings, the rotor moves slightly, clicks and the screen says 'Error 2'. Would anyone be able to advise what I should do? I have checked in the product manual and have tried moving the rotor by hand which works. There is nothing obstructing the rotor, no problem with max load (the error message occurs even when the rotor is empty), and it looks like the rotor is mounted correctly.

Thanks so much and all the best!