I have a hotpoint FDW20 dishwasher which developed a heater fault, I replaced the heater with a new unit & it all worked great for a week, now the water only gets warm & obviously doesn't clean properly. If the door is opened mid cycle it is warm but not hot like it should be. There are no fault light on the front panel & it completes it's cycle. I have checked the heater again and it is fine. I can only think that it could be contacts on the relay on the control board. I plan to replace the relay but does anyone have any ideas?