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What is the pressure on the gauge?
Ok then that's why you have a PRO. I need pics of the piping around the boiler to tell you how to bump the pressure back up to 15 psi.
Need pics of all the piping not the gauge
I only see one and it doesn't show me what I need. I'm looking for the feed valve (see attached pic for typical) on the water line into the boiler. It's usually 1/2 pipe.
Not at all like my pic. All feed valves no matter the manufacturer have the same basic shape with a sort of bell shaped top. They are also in a water line not directly conected to the boiler like this pressure relief valve. There is one other possibility if you can't find it show me a picture of the expansion tank (see attached, could be different color)
Please try posting again