If your Matsui MF2W/A timer stops earlier in its cycle, turn off the water and unplug the machine.
Pull it out and put it on its back. Remove the base panel. Remove the anti-flooding interlock. Unplug the two cables feeding the heater element and check its resistance. Should be 30 ohm or thereabouts. If not the heater's defective and you should replace it.
Pull the cables off each of the two thermostats and check resistance. It should be in the order of .5 ohm or less. If the reading is high then replace.
Remember there are two thermostats fixed to the dishwasher pan. One at the right back lower, and one at the left back lower. For the left hand one you may find it easier to access by removing the lefthand dishwasher panel.
And that’s about it. Job done.
Nimrod
November 2012