The same thing happened with the hea two days in a row - tell me what you think...
I get home, turn up the thermo from 62 to 72, system kicks on - I wait 10 minutes, then I bleed all the radiators again - from top to bottom (all give out only clear water), then I go to check on the boiler. outbound pipe that has the issues was hot, then it went cold (while the burner is cooking!)...all the inbound pipes were hot.
I check the radiators, only 5 of the 8 are hot. Two are cold, one lukewarm. I mean ice cold...I do a quick bleed on these two, and cold water comes out...
Back to the basement - the system kicks off - the air release valve over the expansion tank gives off 4 or 5 quick hisses, then the circulator on the inbound pipe kicks in, then the burner turns back on...at this point, the outbound pipe gets hot -real hot, and in 5 minutes the three cold radiators are blazing hot.
So essentially, If I waited 20 minutes, all the radiators would get hot, just some faster than others...Is this right?
Also, my expantion tank has a air nipple on the bottom, like on the tire of a bike...Is this to pump in air or to let it out? Thanks,