The first post of this thread shows all the Samsung codes for which there is a known function. The next post lists other function numbers, for which there is no known actual function defined by Samsung. The idea behind posting them is that you can experiment with the unattributed codes to see if they cause a response from your equipment.

So function number 238 probably does nothing, but if you could try it and other numbers to see if you can discover new functionality that Samsung may have added.