I have a simple (only on gauge, from 0 to 60 psi) regulator that came with my kegerator. It worked fine for 5 years, but recently it's getting stuck.
I have to open the adjustment dial a lot to get the needle to move. When I do so, the needle is not responsive at all, it takes minutes to react.
After I had opened it very wide, it showed 30 psi. I turned it all the way back, but the needle stayed at 28 psi. Even when I disconnected the co2 tank, the needle stayed at ~25 psi.
Somewhere online I read that some people manage to freeze their lines, but I don't think that's the case here. My kegerator is set to 5 degrees Celsius, and when I left the regulator out for a few hours on a piece of paper, no water spots (from thawing ice) appeared.
I hooked up a different regulator, and that one's needle reacts instantly to me changing the dial, both when I increase and decrease pressure. That second regulator also has a 2nd gauge showing the pressure left in the keg, and that needle was at around 600 or 700 psi, so I don't think it's a problem with the co2 tank.
How can I fix the first regulator? Is this a matter or oiling it? (Is WD40 food save?)