The AC filter when old blocks the throw. Get it cleaned/changed or if you dont want to spend any money and dont mind outside smell, just remove it.
The tape code can be provided by shahnawaz, you can call them up and see if they can help you on the phone, but as ahsan said do check out your tape manual first. There should be a card in it with the tape code on it. Otherwise, Storm may be able to provide you with that.
Also, if you enter a false code 3 times the tape wont accept another one for 24 hours.