Our house has a central air unit. It was broken when we bought the house, and being huge fans of the 100+ degrees our Missouri summers provide, we’ve yet to fix it.
Ruby told me how to fix it today. (Mind you, it was 82 in the house and quite comfortable with just the ceiling fans.)
“Just change the batteries. It probably uses the biggest size. If you put new ones in, and turn it on ‘normal’, it will probably work.”
She thinks in terms of broken toys and the thrill of starting the dishwasher on ‘normal’.