There is no current product with that Model made by Steamist. The Steamist Leisure Time (LT) Series did not offer a Model No. LT-150 and the series has been discontinued for a couple of years now. If you bought this product on line, it sounds like you may have purchased a Chinese knockoff. I would suggest you check your warranty and reach out to whoever you purchased this from to ask for assistance.
I have included a link to the Steamist TC-135 control Error Codes
but, as you will see, there is no EE code. Let us know what you learn and if we can be of further assistance.