Central lock issue

My first post.

I bought myself a 98 octavia and after replacing blower fan, installing leather seats (from a jetta) and taping some wires for central locking and windows in the doors and replacing some lamps i have been allmost satisfied with it.

My problem is central locking, when i open the car from remote it opens all doors but when i close the doors only drivers, rear passangers and trunk closes. 

When i quickly press close open close open close then all of the 5 locks get closed.

I have opened driver door panel and checked the big plug that goes to the thingy controlling windows etc. and it seemed to be ok. I have also checked all the wires that go in the rubber tubes from the door to the car chasis. I have also removed the central lock unit and remote control unit (witch was installed by previous owner) and observed them visually and the wires seemed to be ok.

I dont know is the problem in the central lock box or in the remote control box? The wiring should be ok because the locks work if you open,close,open,close repeatedly.

Also i have discovered that when i turn on the ignition i can hear a sound from the passangers door lock, i think that ignition is somehow connected to the opening pulse but have no idea how or why

I have considered buying a new remote set http://www.rclick.co.uk/product_info.php?cPath=50&products_id=1112 and installing it myself, but if the problem is in the central lock box it wont be any help.

Oh and when i use the key to manually open the car it opens/closes the same doors as the remote. So is the problem in the central lock box and can it be fixed?

Thanks.