Question edited for clarity.
Question moved from Computers category.
Wash temperatures are not able to be changed, they are dictated by the thermistor sensor and the setting of the EPROM in the control board, however, the 40' Wash temperature refers to the wash labels tags in clothes. About 20 years ago when HE detergents came out, manufacturers reduced water temperatures by 10'C, so although it is a '40' Wash', you should find the temperature is lower. Check it with an infra-red thermometer.