Have an odd situation that started a week or so ago. The dishwasher was running to completion and dishes were either still dirtyish or the dishwasher pod was not dissolved and the dishes basically unwashed.

The model is a GE GDT535PSJ2SS.

After digging into it more and watching several cycles and testing it in between cycles, the issue appears to be with the inlet water temperature. After initial fill, if I open the dishwasher and touch the water in the sump, it is cold.

The dishwasher is connected to a separate tap from the hot water on the sink (likely the same line with a Tee behind the backing) which means I can't run the hot water tap till hot and then start the cycle. Further, playing with the hot water in the sink, I noticed that on opening the tap and setting it to hot, the water is luke warm, then cold then progressively hot.

My theory was a bad mixer in the kitchen sink tap causing backflow of cold water into the hot line. But closing the hot water off in the sink didn't seem to affect the first test.

I am planning to shut off all other mixer taps in the house and run some more tests. Any other thoughts?

Thanks in advance.

  • Are you absolutely certain it should be connected to the hot supply? That's a huge waste of heat & water. I've never known any dishwasher that connects to hot. [Clothes washers used to until maybe the late 90's but they don't either these days. My first dishwasher was mid 80's & cold feed only even then] – Tetsujin Aug 17 at 9:01
  • According to the manual, yes. See page 8 here products.geappliances.com/MarketingObjectRetrieval/… – user122211 Aug 18 at 14:50
  • I wonder if it's for the same reason electric kettles aren't particularly popular in the US - 120v being poor for rapid heating elements. – Tetsujin Aug 18 at 15:29

Sounds like the separate tap is connected to the cold supply.

The most likely failure is the internal water heater element or control in the dishwasher. So check that. Build up of scale like in a kettle is a common failure for those heating elements as thick patches cause them to get too hot and overheat.

Using a cleaner is a good idea - Calgon is one name but may not be in your market / location.

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  • I find it hard to believe someone would connect a DW to the cold supply. But you're right, it's something to check. I'm wondering what type of water heater is supplying the DW. If "on demand" perhaps something is wrong there and the DW isn't drawing water fast enough to turn it on due to wear and tear there. The fact that there are large variations when (s)he is "playing with the hot" it gets warm, then cold, then hot tells us something. Let's be sure the DW is on the hot feed and see what WH (s)he has. – George Anderson Aug 16 at 13:56
  • @GeorgeAnderson well, mine is connected to the cold supply and so are all the ones I have checked with my friends... – Solar Mike Aug 16 at 14:10
  • That is so weird. I've never heard of that in my part of the country (pacific NW), but I don't have a lot of building experience. I'd love to hear from others on their opinion. Thanks for the resp. – George Anderson Aug 16 at 14:15
  • The separate line is hot. If I run and cancel the dishwasher a couple times after the initial fill, it ends up filling with hot water. The other thing is, the setup has not changed since the house was built. So something recent has caused this issue. – user122211 Aug 16 at 15:27
  • I wasn't aware the GE could heat the water. I checked the user manual and it states that incoming water must be 120 degrees. – user122211 Aug 16 at 15:29

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