Hi  @PLOTH 

Thanks for posting here.

The other unit has all 3 signal lights lit up constantly. 

>>>Is this one the main unit of the sub one?

What's the hardware version of the EAP?

When you reset, did you reset both of the unit or only the problematic one? 

If you didn't try that, please factory reset both of them, and put them together, configure again.

Also, you can switch their roles and see if it helps:

Hi  @PLOTH 

Thanks for the reply.

The SUB unit's signal light is illuminated, indicating it's receiving signals from the MAIN unit. This suggests the hardware is still functional.

To help troubleshoot:

1. How did you determine they were disconnected? Was the network unavailable?
2. Is the MAIN router's network operating normally?
3. Can you still access their web interfaces?  if yes, please try Change Role as I mentioned before.

To get a real-time help, you may call hotline team. They will guide you step by step.

PLOTH wrote

  @Vincent-TP 

 

The Sub one has 3 lights for signal, the main has none. 

 

Hardware V1 

 

Yes reset both a number of times. 

 

Still no good.