If you are not using any other aquabus devices, the aquabus ID number cannot be the problem. Even though a 3-pin aquabus cable is sufficient, a 4-pin cable is usually the better choice as it is less prone to interference.
You should connect the pump via USB anyway to check whether its controller is still working properly. Unlikely but not impossible: Maybe your aquaero and pump are currently on different firmware levels that are not compatible to each other. This could also be clarified via the USB connection.