Did a job a couple weeks ago for some guy, he sent me to another job.
He said service valve was leaking and he wanted me to fix it, he also said the defrost board was bad.
The leak was two copper pipes rubbing each other, the defrost board was still good he just took the H/P switch out of the loop.
I have seen this a lot with Ruud units.
So what up with Ruud H/P switchs?