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Whirlpool Dishwasher not heating water

15K views 13 replies 5 participants last post by  Bigplanz  
#1 ·
Before I go buy a new dishwasher, I would like everyone's advice on my problem. I have Whirlpool dishwasher, model # WDF330PAHB1. The problem is the water doesn't get hot. Cold water washes, well, they don't really work, of course.

So, I googled up my problem and the conclusion was one of two things was wrong with my dishwasher. Either a bad high limit thermostat or a bad heating element. I pulled out the machine from under the cabinet, turned it on its back and did a continuity test of both parts (I found a parts location diagram on-line). Had continuity on the thermostat, but no continuity on the heating element. I ordered one (which I tested for continuity, which it has), I put it in. Water still isn't getting hot.

For good measure, I also replaced the high limit thermostat (because a new part was so cheap). Nothing. No hot water. Anybody have any suggestions on what is going on here? I can go to Lowes and get one if I have to, but would prefer to fix the one I have.

Here is a video I shot showing what is going on. Thanks!

 
#2 ·
I don’t have a service manual for your dishwasher, so take what I write with a grain of salt. You replaced the high limit thermostat, which prevents overheating the dishwasher, but you haven’t mentioned the thermistor that measures the temperature of the water and provides the input to the control panel for it to determine when to energize the heating element.

 
#3 ·
Thanks! This helps a lot. I am 100% sure the heating element was bad, as it showed OL on my meter when connected. The new one showed resistance and beeped as it should. I will replace the thermistor. Hopefully, this will solve my problem.
 
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#6 ·
Thanks. I made sure the connections were all good and tight when I installed the new element and thermostat--twice.

It occurred to me that the element wasn't getting power. Since the element is on the bottom of the machine, and the machine has to running to test it, it is a bit awkward to get a test probe on a connector. I suppose a non-contact voltage tester (kind that beeps) would work well enough. Have to check both sides of course.

What has me curious is how to run just a heat cycle. As far as I can tell, the heat cycle is part of the regular wash cycle, so I would essentially have to run a load of dishes while waiting for (when?) the heat cycle starts. I can do it this way I suppose.

Question: let's say there is no power to the element. What then? Let's say there IS power to the element, what then? I am assuming that the element isn't getting power since it isn't heating up and it is snuggly connected and it's brand new. The old one was bad-- no continuity.

Here is a picture of my machine's control panel. There appears to be no way to turn on "just" a heat cycle. Thanks for taking a look.
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#10 ·
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I gave it a try, no dice. Element is good, heat not coming on. Eh, dishwashers aren't that expensive and, you know, the dirty dishes just keep coming....
 
#9 ·
Yeah my Toyota Avalon hasn't given me any problems at all. Brake pads need to be replaced, but other than that, it runs perfectly. Kind of a let down, after the many little jobs I did on my Lincoln Navigator. I think I will probably just buy another dishwasher. Since I retired I am finding more fun things to do with my time than fix broken stuff. I give it a shot, but if that don't work, forget it, get another one. Keeps the lady of the house happy, you know?
 
#14 ·
It is pretty wore out, all right. A lot of loads of dishes have gone through it.

I pulled out and checked the element, it had no continuity, so I put another element in it. That didn't work. Replaced the high limit thermostat, for good measure. No change. I think this thing is now on the Do Not Resuscitate list. I will look into a new one, scratch and dent, while I look up other possible (cheap) fixes.