Those white pins are for the DC8 address. It sounds like you have an address conflict. The best way is to read the manual on how to see the address.
How many DC8, DC4, Aquasurf, lunar modules do you have?
How are they connected in order?
Example: Controller -> DC8 -> DC4 -> Lunar Module
What are the address of each module (how are the pins set, which are up and which are down)