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End of Line trap blockage
in this situation, the end of main F&T trap is clearly blocked (ie. condensate pipe on the other side is stone cold)
the main feeds a few radiators that have condensate return lines feeding another condensate return pipe
eventually, i suspect the steam main would accumulate and fill up with condensate (there is pipe banging)
the main is still very hot where it meets the trap.
how long will it be before the main fills up with water? and what other problems can happen?