Utterchaos Posted November 21, 2016 Share Posted November 21, 2016 Hi I have an open vented heating system, need help I keep getting air in one radiator, boiler is upstairs and it's one upstairs rad that gets air in it to the point it needs bleeding nearly every day, the system was power flushed, it is air not gas in the rad tried lighting it etc, I have checked the vent pipe and when boiler starts it is sucking in thru vent, (cup of water under vent pipe) it then pushes this water back out again, any idea how to stop this air from. Entering system, could it be because the feed is on the negative side of the pump, also is the feed/expansion tank ment to get warm/hot as mine is Quote Link to comment Share on other sites More sharing options...
suke Posted November 22, 2016 Share Posted November 22, 2016 I'm not an expert but water expands as its heated and thats the reason the feed/expansion tank gets warm. You can get an automatic air bleeder that fits on the side of the radiator replacing the bleed screw. This would then get rid of the air for you. As to why its happening i can't help you with that one. I'm sure someone with more experience than me will come along soon with the answer. Quote Link to comment Share on other sites More sharing options...
Utterchaos Posted November 22, 2016 Author Share Posted November 22, 2016 Think I found the cause, air separator seems like its blocked up, the fees pipe is magnetic so would make me thing it's maganitie in there, so going to cut the lot out Saturday and put new in Quote Link to comment Share on other sites More sharing options...
luptort Posted November 24, 2016 Share Posted November 24, 2016 try turning the pump down, if on too high it can "suck" air in through the expansion pipe. Quote Link to comment Share on other sites More sharing options...
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