It sounds like your balance switch if faulty (similar problem to my 7.5) Remove all power first, If you can remove the front panel, then remove the large control box via possibly the one screw, under that should be a small switch block with 2 wires coming from it. Remove this switch and you may find that the small detent is stuck. try some WD40 or other spray and try to free this switch. Put it all together and hopefully alls well!!!!!!
Mike, November 2008