Celestron AVX: Error 16 - error 17: No response

Problem

When you turning on the mount, the hand control shows the following behavior:
- A "seeking mount" message appear. 
- Following by the message "No Response 17" Invalid Model. 
(Could by also show "No response 16") 

Fixes / workarounds 

- The least simple cause is the hand control connector is making false contact with the mount or the hand control need to be replaced. 

Workaround: 
1) Unplug the control from the mount
2) Turn on the mount
3) Plug the control again. 
The mount works as expected, the error 16/17 is not longer appearing. 

Fix: 
Acquire a new replacement control.  You can fin several vendors Chinese vendors on Ali Express:
https://www.aliexpress.com/w/wholesale-celestron-nexstar-hand-control.html?spm=a2g0o.home.auto_suggest.1.650c76dbvOZGgv

- The worst of the cause is the controller board is damaged 
Contact celestron.com support