If your water reservoir is at a high level, there is a pump that pumps condensate from a tank at the bottom. If the pump fails, the tank at the bottom fills up and a float switch cuts off the power. The pump may be blocked by debris. On ours, the pump etc are accessed via a plastic cover at the bottom left (from the front) of the rear panel. The switch connections are not very well protected, so unplug the machine first!
Good luck!
Flionus
December 2009