[effingwewt]

Could not be getting hot enough, the heating element and thermistor go bad fairly often. Vents, drain pumps, all go bad so often it's pretty crazy.

As mentioned below def use rinse aid, but I've also seen where people use too much rinse aid and it clogs the spray arms, etc.

You can google your model number and see the steps to enter diagnostics, as well as what the different codes mean.