Hi, thanks so much for you help! I vented all the radiators a couple weeks ago at the start of the heating season, there was no air in them. I am thinking, could that be related to the fact that most of the radiators being closed. Since it's not so cold right now my parents don't have all radiators turned on (only 3-4 out of about 12) and there being less water in the system to ciculate? Or is that irrelevant? Besides the radiators, is there another circuit that needs to be vented?
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