If you lost your home at a trustee's sale where the first trust deed foreclosed upon the security for your loan (your home) and you home equity line of credit was in a second secured position by your home, its secured position was wiped out as a matter of law by the foreclosure of the senior lien.You are obligated to pay off your your home equity line of credit that was in a second secured position on your home assuming it was not part of the purchase of your home (purchase money). From what you have written, it does not seem to have been part of the intial loan process when your home was acquired.If you do not pay on your line of credit, the lender can file suit against you, possibly obtain a judgment against you and then start levying on your assets to satisfy its judgment against you assuming one is obtained.You should consult with a real estate attorney about the effect of the foreclosure of the first trust deed (mortgage) and your obligation under the home equity line of credit that was secured by your home.Good luck.