The EcoTech manual says for the blue/red code:

Misc. Error
This error could be attributed to a communication error between pumps or an unidentified error in the wave driver. Move the drivers closer together and minimize any physical obstructions in between the drivers.

... and...

Operational Range
The wireless signal range is roughly 10 feet when drivers are within a direct line of site. Masters and slaves must all be set and operating near one another to avoid signals being missed. If a pump generates a red/blue error message, this means that the master and slave pumps were not close enough to one another when they were setup. Depending on other electromagnetic interference or other variables, wireless range can vary between 2 and 10 feet. The wireless signal will not pass through water.


You should check/try following:
Make sure the VorTech-Controller and the control unit for the EcoTech pumps are in the communication range of 3m
Avoid high interferences (e.g. near fluorescent tubes) or physical obstructions (the aquarium itself is a obstruction)
Clear all assignments (PLC:VorTech overview->Delete assignments of all...)
Try to assign only one EcoTech at a time (disconnect all others from power)
- EcoTech: Reset pump
- EcoTech: Set Assign Slave mode
- PLC: VorTech overview->End and save assignments of all...