Relay crashes system

I have an 8 channel relay out at my pool that works fine manually by pushing buttons on the relay and off to control loads BUT each time it's power supply/circuit breaker is turned on it crashes the rest of my cbus network.

All light switches then stop working and blink if touched leaving lighting in its then current state.

To make it more confusing, cbus toolkit cannot connect to the network whether that relay is powered up or not so am not sure how to diagnose what is occurring.

 

Can you give an idea of your C-Bus experience please
How are connecting your PC to the C-Bus net CNI, PCI, etc.
Is the Pool house on the same network as the rest of your home or via a bridge.
Either way check for correct wiring especially the colours

 

I have a 12 channel relay that has just developed the same fault. Thankfully I have another relay unit that has a dead power supply. I am hoping that I am able to resurrect one of the units with parts from the other.