Not sure how long you have had this unit. The most obvious reason could be the heating element has failed.
After going over the problems described in horror stories by owners of this model of dishwasher, I am not sure if you will be able to get LG to service it at all.
Worth asking your local LG service centre if there is one.
What you mention is a possibility as the manual mentions that the inlet water temperature should be 120deg F.
But it must come with some sort of heater because it does mention the wash cycle is at 140deg F. Also in trouble shooting section it mentions that the wash cycle will be extended if the temperature of inlet water is not sufficient. See page 18.
http://specs.retaildeck.com/CACHE/FILE15...
In case you want to get a better idea of the construction of your dishwasher refer service manual at
http://136.166.4.200/contents/Dishwasher...
The heater specification is mentioned on page 5. It also shows how to run diagnostics tests including checking the heater.
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After further research in the owners manual docs it appears some models may not be equiped with a heater.
I suspect this is the case for my unit from what I read.
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