Dishwasher water won't heat

I have discovered that the water isn’t heating in my dishwasher leaving food and undisolved detergent on my dishes/glasses. Can anyone give me a comprehensive list of all parts that could cause this and directions to make repairs myself? It is a Whirlpool Gold Quiet Partner III, model GU1200XTKS0, series FM0618431, type 575-0. Help is greatly appreciated. My budget won’t allow for calling a repairman.

Thank you.

Hello,

I have the same problem with this model. Just realized today it was not heating. Did you fix yours and if so what was the problem?