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How can I fix my Hotpoint DWF31 dishwasher?

I am experiencing an onging problem that when the machine is switched on the timer keeps reverting to display a 2 hour time and then seems to start the wash process immediately and then after 2 hours the time reduces to the time selected and continues the cycle. The water does not seem to be heating and by the time it finishes after some 3 to 4 hours the drying temperature does not feel as hot as it did previously. Any help would be appreciated or it looks as though it is a throw away and replacement job.
Eddie, November 2010
It appears to be similar to the Bosch SHU53.

See diagnostic mode instructions here:

http://fixitnow.com/wp/2010/09/01/bosch-dishwasher-test-programs-diagnostic-mode-and-error-codes/

finiteresource, November 2010
link Click here to see other fixes for Hotpoint DWF31.