You should review your contract with your agent, if your offer was subject to FHA financing, the seller should make repairs required by the lender per FHA. If not, you may want to change your financing to allow borrowing extra money to fix repairs, FHA 203 or 203K. Depending on the amount of the repairs required. Your agent should be able to answer you on these questions, if not, talk to his/her Broker.
If the seller is not going to do the repairs required to do the loan, you may have to look for another house. Hope this helps!