My washer will not fill with hot water. It will only fill and work when I choose the warm or cold settings. But, when I choose the hot setting, the washer will not dispense any hot water nor will it even work. What is causing this? Please let me know what part I will need to replace, thank you. 
Those issues are not to take lightly as it can damage your machine and even make not usable anymore. I highly recommend not doing this on your own and contacting the appliance experts for this matter. They can assist you with such issues, and they are available 24/7.