I had F22 coming up on window. I looked up Videos and managed to follow instruction to open Right Valve and then Left Valve to fill with water pressure. I turned left off when pressure went up but now the Right Valve won't turn!! I tried gently as I don't want to break it. What is the solution? As I am afraid of Gas I turned the main switch to off!! Please advise ! and tomorrow is Sunday !

Abinet, April 2017

I will answer my own question. After struggling to turn that Nob for several hours i gave up and called the Plumber. The plumber just walked over & turned it ! After he turned it I tried my hand at it to check and it turned easily. So it's a mystery to me !

Abinet, April 2017