An entry of code "W" in box 12 of your W-2 indicates to the IRS that you have an HSA. The FSA deductions are reported either in box 10 (for a dependent care FSA, as in your case) or in box 14, as information for the taxpayer for other types of FSAs.

In particular, the amount with the code W in box 12 is considered a contribution to your HSA. You are required to file a form 8889 if you have contributions to or distributions from your "HSA".

You do not want the IRS to think that you have an HSA if you don't, because if you did not file a form 8889, they will ask you about it. And if you do file a form 8889, well, you have no need to file a form 8889, if, in fact, you don't have an HSA.

Ask your employer to issue you a corrected W-2.