Thanks for your reply, Ray. Yes, it is exactly as you put it. If there will be no water then do not run programs. The lack of water is reported to the system by the set of hardware listed in my original post.
This post was started by me using my login name. Unexpectedly my account here disappeared and this post now shows as been started by an anonymous user.
I had to re-register to access the site.
Unfortunately, anonymously or as a proper user I got no answers to my problem.