just recently the water in my dishwasher seems to be running at different temperatures. Twice the dishwasher has finished its cycle only to find on completion the tablet hasn't dissolved. checked and cleaned all filters, no probs there, tried again and result was pre wash was a cold wash then went on to wash cycle after what seemed like 10 to 15 mins the water got hot tablet dissolved this time but then water soon went to luke warm for rest of wash leaving dishes unclean. on reading some of the forum i understand there's a temp sensor some where could this possibly be the cause if so where is it and how can i check it out. can anyone help, the wife is making me use the sink!