Dishwasher drains only when water in the bottom has cooled.
My dishwasher is barely a year and a half old. Model number WDT720PADM2 that has worked great until recently. It runs the cycle perfectly and then there is water in the bottom at the end. If I go and manually press the “Drain” function it will make a noise like a murmur but not drain. If I wait a few hours until the water cools (the pump even), it will drain just fine.
I don’t want to rip the pump out before knowing, but is it possible that the pump gets overheated during a cycle and won’t properly work until it cools? I took the drain line loose thinking that was the original culprit and it clears well on it’s own (I blew in it and had no issues). I ran vinegar/baking soda through it a few times as well to help clear that even more.
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