How can I fix my central locking on a 09 ford transit?

My 09 ford transit doesn't lock or open by pressing the buttons on blue key. I had a new key done at fords as thought the battery had gone. But after they programmed my new key , told me the new and old key were transmitting a signal to the van , so the central locking on the van must be faulty. So have to open and lock by using the key in lock. Which is driving me mad when I'm back and forth getting tools out. I just wanna press a button.