Baseboard Heat Not Working Downstairs

[tymatr]

I have a boiler system with two circulators, one for the upstairs and one for the downstairs. The downstairs has two branches and one of the branches is getting hot water fine (the shortest one), but the longer one appears to fail to get hot water past the first register.

Could it be clogged? If so, how would I clear the clog? I have no bleeder valves on this part of the system on any register.

Thanks!

[kilowatt]

Before you go looking for a plug check other items. are you sure pump is on? Have you had the system open for repair? Could be air. Do you have the proper water pressure? Usually a plugged system would mean its dirty.

[kilowatt]

just re-read. No vents could be a problem. Do you have any drains [hose connections]on pump so you can flush back through the system?

[NJ Trooper]

Could be air.

I agree that it could, and will say that it PROBABLY is... unless of course there are valves closed that should not be.

AIR is just as effective a plug in a pipe as an old potato chip bag.

Why not post some pics so we can see what you are working with? free account / Image hosting, free photo sharing & video sharing at Photobucket / upload there / drop link here so we can view.