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Boiler sight glass - Possibly clogged?

Hi all,
Relatively green when it comes to steam boilers. I have been on here lurking for a while so I know enough to be dangerous but not enough to be useful.
I had my boiler serviced as part of my annual contract with my oil company. After I noticed the sight glass was completely full of water. I let the heat run for a while to see if the level moved, after a long time - it did not. I did a blow off to see if that would adjust the water - nothing. So I turned it off, let it cool and removed the glass. In the process...I broke the glass but also learned how to replace it. I played around with the valves when it was off and the lower valve produced no water even when fully open. I added some water to the system to see if it was low - but nothing. I sort of fished around the valve with a pipe cleaner but I was hesitant because I didn't want to damage anything and have no idea what I am doing. So my question to the group - is it possible its clogged? If so, likely with what? Just sludge? Can I prod it some more with a thicker gauge wire maybe? Should I try to drain the entire thing and take off the whole valve (that seems like a lot). Could it be something else? The gauge does fill with water, but it seems to be from condensed steam from the upper valve.
Relatively green when it comes to steam boilers. I have been on here lurking for a while so I know enough to be dangerous but not enough to be useful.
I had my boiler serviced as part of my annual contract with my oil company. After I noticed the sight glass was completely full of water. I let the heat run for a while to see if the level moved, after a long time - it did not. I did a blow off to see if that would adjust the water - nothing. So I turned it off, let it cool and removed the glass. In the process...I broke the glass but also learned how to replace it. I played around with the valves when it was off and the lower valve produced no water even when fully open. I added some water to the system to see if it was low - but nothing. I sort of fished around the valve with a pipe cleaner but I was hesitant because I didn't want to damage anything and have no idea what I am doing. So my question to the group - is it possible its clogged? If so, likely with what? Just sludge? Can I prod it some more with a thicker gauge wire maybe? Should I try to drain the entire thing and take off the whole valve (that seems like a lot). Could it be something else? The gauge does fill with water, but it seems to be from condensed steam from the upper valve.
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