air in rad

[ciaram]

Hello!
I wonder if anyone can help. I had all new rads fitted throughout house over the summer. I have a conventional boiler, not a combi. Since turning the heating on about 6 weeks ago, the rad in the little bedroom upstairs keeps filling up with air. I have to bleed it every 7 to 10 days or else it is completely cold. It does get hot when bled. Today I had the plumber back out who fitted them. He checked the pump and expansion pipe etc and said there was nothing obvious and if it got worse to call him! He said the only other thing he could do is drain the system, but that this was done when he changed the rads. So I am not a happy bunny!

With very little knowledge, I presume air is getting into the system and if left unchecked air plus water equals rust. Should I check for leaks, and if so, what is the best way to go about this? Anything else I can check? I am determined to get to the bottom of it. Could I politely ask if anyone is good enough to reply, that you use simple English, as my knowledge of plumbing is, well, crap!

Thanks so much in advance!

 

[keego]

Without seeing what's been done it would be difficult to say what is causing it.
The one solution would be to convert the feed & vent pipes to a combined feed & vent, not a job for you but you could suggest it to your plumber.

 

[Armo74]

When air is being drawn in it is usually via the vent pipe due to a blocked cold feed from your feed and expansion tank. Make sure ALL vents have been bled.

 

[keego]

When air is being drawn in it is usually via the vent pipe due to a blocked cold feed from your feed and expansion tank. Make sure ALL vents have been bled.

Which is why I suggested putiing a combined feed & vent in, if the cold feed was blocked then the rads wouldn't fill when vented.

 

[Biguns]

Just a point. Ensure the system is switched off when bleeding

 

[gas_man_gaz]

wen you next have to bleed the rad try lighting the gas which you release, if its flammable its not air and prob just needs a few bottles of inhibitor chucking in (use a good brand such as fernox)