Leak sensor is unplugged and so are the Presence sensors.
well its def finding something .. means its working ...
Do what we both told you .. and see what happens.
sorry I have to go .. please do what we ask ..
So I am on 20 for the bandwidth. Channel are auto and power is auto. will change them 1 and 6
no .. use ( 1 ) < is best
OK i have 3 APs.
Sorry I had a fourth one for guests to a separate network.
Note I can turn off all wifis too.
So far no change.
No change. I rebooted the radio just in case. I can try moving to 25.
If I turn on the radio on my C7. I can pair a device and it work as expect with no channel change.
Make sure to put C-7 zigbee on an unused channel. It doesn’t actually shut off the radio when it’s disabled, just disables the zigbee stack.
Thanks. I do want to C8 I don't know why C7 works but the C8 doesn't.
If you delete a powered Zigbee device from the C-7 and immediately try to join it to the C-8 does that work? You may need @gopher.ny or @bobbyD to have a look.
I have tried with a water sensor. That's why my water sensor isn't joined to c8. I reset the water sensor. I joined it to C7. I tested terrific Reset, did it again and then attempted to pair to C8. I cannot pair anything to the C8.
Agreed...
I want to thank you all for your support. It is so greatly appreciated. I learned some new things in the process. Thank you all for showing the 
!!
I put the c7 16. Nothing is paired and now I will disable again.
Just to keep track.
C8 ZigBee CH 25 <-need to wait 24 hours. or reboot devices.
C7 ZigBee CH 16 and Disable.
I did auto-optimize the WiFi again.
Wifi channel?
I optimized 1,6
3 aps are on 6.
I'm would think 25 would be out of its way.
UniFi pick the channels.
That will work, keeps Wi-Fi away from Zigbee channel. 
Wifi 1,3,6
12-14 hours after setting 25 ch for Zigbee, no devices in the mapper and still cannot pair.
The Zigbee network is unresponsive.