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Water not hot enough

I have an LG LDS5811WW dishwasher that is not getting hot enough to wash clothes or melt the wax cap on a bottle of dishwasher cleaner solution. I have checked the continuity of the heating element and it is good. When I enter test mode and check the thermistor, the temperature displayed is 40 degrees Celsius or 104 degrees Fahrenheit. Much too low. That is lower than our water heater temp so it must be cooling off after it runs awhile. The heating element is obviously not providing any heat. What next?

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Before you start dishwasher on your sink start the hot water then after you start dishwasher then you can turn sink off. Hopefully this will help.

Posted on Nov 17, 2013

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  • Scott Whitley
    Scott Whitley Nov 17, 2013

    Thanks for the suggestion. We did run the hot water before starting the wash cycle. It tests to about 130 Degrees. The water is that warm initially in the dishwasher but cools fairly quickly. The heating element is not doing anything to maintain the water temp at the hotter temperature. As I stated before, I tested the heating element and had good continuity. What is the next thing for me to test? I have found out that the Thermistor is part of the heating element on this model. How do I test that since it is all together? Any solutions? Thanks All!

  • lee knowles
    lee knowles Nov 17, 2013

    That sounds like the problem is in the board and in that case you may want to replace it. Sorry I hope it is still in warrenty.

  • Scott Whitley
    Scott Whitley Nov 17, 2013

    Thanks Lee. As an update, I removed the front panel and tested the voltage at the location on the board for the heating element. There is voltage so I am thinking it is not the board. I have one last test to do. Since I have found out that the thermistor is located in the assembly with the heating element, I am going to remove the heating element again and test the continuity of the thermistor as I change the temperature of the sensor end of it. If is bad then I will by a new Heating Element/Thermistor unit, if it is not bad, then I have no idea what to do.

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You should always turn the hot water faucet at the kitchen sink first before starting dishwasher. If you don't your entire wash is cold water. This will also cause the water temp mode to take forever to heat the water to the 140 that is factory set. Hope this helps.

Posted on Feb 03, 2010

techbuster
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There are many probable causes of failure .

A dishwasher's water inlet valve is its most common part to fail. When your dishes are not being fully cleaned, quite often a faulty water inlet valve is to blame. Test your dishwasher's water inlet valve, and if it is no longer functioning as it should, you will have to replace it.

Water temperature is a key element in achieving clean dishes. A dishwasher's heating element is not designed to heat the water that enters it. Rather, the heating element is designed to maintain the heat of the water that enters the dishwasher. Its a good idea to run the hot water in your sink for a couple of minutes before you run the dishwasher. Just to make sure the water is nice and hot before it enters the dishwasher. If the water is unable to stay hot, it can adversely affect your dishwasher's cleaning ability.


There is a filter in your dishwasher. Its function is to keep large particles of food and foreign objects away from the pump. Many of the newly-manufactured dishwashers have self-cleaning filters, and routine cleaning isn't a concern. However, some other dishwashers need to have the filter removed and cleaned regularly. If the filter or grate is clogged or blocked with debris, it may interfere with the normal functioning of your dishwasher

A helpful rating and a testimonial would be greatly appreciated if you are satisfied with my solution..

Posted on Oct 22, 2010

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Hello Craig,
You can use Affersh dishwasher cleaner (link here) http://www.affresh.com/our_products/affresh_dishwasher_disposal_cleaner and to achive "Super hot" wash you can reset your hot water heater to a super high setting and the run a few cycles of the dishwasher....once done be sure to reset the hot water heater to the usual setting...also a very effective cleaner in the dishwasher is white vinegar ,try that along with setting the water heater higher

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Any store which sells dishwasher powder/tablets will usually sell dishwasher cleaner as well.

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