Question on Steam Trap

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Author Message   paola Citizen Username: Paola Post Number: 27 Registered: 8-2005 Posted on Friday, March 3, 2006 - 10:34 pm:        I have 2 bedroom radiators that get fully hot when the boiler first fires up at a temperature setting of 74F. However, throughout the night, both radiators are stone cold. Only towards the morning around 7AM do they warm up again. If I increase the temp setting to 78F in middle of night to get the boiler going again, then the 2 radiators become hot again (after some banging in the pipes). BTW, I have 3 other bedroom radiators that continuously emit heat throughout the night at same temp setting of 74F. I thought maybe the problem with the 2 cold radiators is a faulty steam trap but my plumber/heating expert told me that b/c the return valve/steam trap was hot initially when the boiler fired up, it means that the steam trap is working properly. Is this true? how can I get these 2 radiators hot throughout the night like the others? What can/should I fix?   Master Plvmber Citizen Username: Master_plvmber Post Number: 490 Registered: 3-2003 Posted on Saturday, March 4, 2006 - 7:46 am:        So your plumber/heating expert has decided the trap is not the source of the problem. Then what did he do?