Not knowing what sort of machine you have - so please forgive me if my advice isn't correct... I have a Westinghouse LT809S -it used to beep at the end of each wash... It drove me nuts. I was fortunate to have the user manual so I could turn it off!!
Instructions are:
1. Hold START/PAUSE pad depressed for 3 seconds - the wash illumination panel will then display either "bP" (beep on) or "--" (beep off).
2. Yours will obviously show status of "bP".. To change this, simply press the WASH TEMP button once, then START/PAUSE to store the selection.
Done!! I truly hope that yours is a similar model and that this does help :-)
Cheryl-Anne (Brisbane QLD Aust)
November 2007