defekt

1. defect; flaw; fault
   Telefon ima fabrički defekt, pa sam ga vratio. — The phone has a factory defect, so I returned it.
   Lift je opet u defektu. — The lift is out of order again.
2. (in medicine) defect
   Beba je rođena sa srčanim defektom. — The baby was born with a heart defect.

The phrase "u defektu" means "out of order".