The top-floor radiators in my Parsons Boulevard walk-up never get hot. What is the most likely cause?
On one-pipe steam, failed air vents on the top-floor radiators or failed main vents on the steam lines in the basement. Steam cannot enter a radiator full of air, so the top floor, last in line, stays cold. A technician tests the vents before touching the boiler. Call (888) 766-1474 and mention which floors are affected, because the pattern is the diagnosis.



