Update!
Ok so there is a part of the ZigBee spec where a device needs to know the time of day it is. We don’t support this in the base spec like other controllers would right now. When the valve pairs it keeps on asking for the time until it gets it. Since the hub isn’t telling it the time, it keeps on asking and asking.
I’m going to either try hacking it in, or see if I can somehow get it to stop asking. If I can’t then it will take a new firmware version which could take a while.