My combi boiler pressure dropped overnight and it has clicked off.
I've refilled it and put the pressure back up to 1 bar but now I don't know if I've put the red lever back in the right position 
. I think it's closed but there's no words to tell me. I'm sure it usually sits at 9 o'clock but I can't remember.
It has clicked on ok and doesn't appear to be doing anything weird so I don't think it will explode.