I just fixed a similar problem on my smartdrive703. From internet posts it seems like this is just an indication that the controller is detecting something wrong. One post suggested that I change the possibly corroded hall rotor sensor, a little circuit board ($50) mounted on the motor windings. I did this but nothing changed. I then found that the out-of-balance detector at the top-right-rear had locked in the pressed position (due to soap deposits). Normally a red tab sticks out of the switch (it wasn't). Everytime you press it, you hear a healthy click, then it springs back out. It is accessed removing the top panel (2 screws), removing the power circuit block (1 screw and lots of wires, pull the block to the right and some water will spill). The out-of balance detector is a simple microswitch which can be bought at electronic part stores. However, all I did was drop it on a hard floor to unlock it, then sprayed it with switch cleaner/lubricant. The machine works now. Be aware that the disassembly procedure is for a 703.
Recycler
June 2007