Climate control not working after disconnecting the battery?

I would do a hard system reboot which should fix the problem, here is a guide to help you:

https://www.2carpros.com/articles/step-by-step-guide-performing-a-hard-system-reboot-for-your-vehicles-electronics-systems

Please go over this guide and get back to us.

Ken L

Many thanks for this information have tried all options with no luck all fuses checked but now suspect it can only be the climate control unit that has blown because unit dead no lights etc. Would you think the same?

Thanks again
Debbie

This can happen due to a voltage surge which can occur when the new battery was installed. Here is how to change the unit out, I would check eBay for a replacement part. Check out the images (below). Let us know how it goes.