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Sheepy, I am sad to say that you may have a leak in your system (or is it a leek?) I can never remember. If the water comes out, the air will go in. With your massive radiators I'm sure they take a lot of bleeding.I have no central heating in my downstairs areas at the moment. I am waiting for the plumber to come with a big part. It might take him a week to get one big enough. I am still hot upstairs, but that is not the best place to be hot especially if you want to work downstairs.
Woo !! Thank Ewe Karen. That's a wonderful load of info !So really, it's a simple affair. I have to sit back, pick up the phone and get someone to do this for me :-)I do know my radiators have bleed valves so I gather this is a good indication that my system is not sealed eh ?..That's good !..because I would not know how to do a pressure check...unless it involves banging my neighbours front door at 4am with my pressure cooker...would this help ?
Having to bleed radiators often can also be a sign of corrosion. This results in hygrogen production and, as I learnt from a plumber friend, you can check this by bleeding the radiator and seeing if you can ignite the gas coming out. Another problem, less usual, can result from the level setting in the expansion tank (if it not a pressurised system). The heating and cooling can continually expunge water and then take in fresh water along with dissolved gases. Normally the gases gradually come out of solution but if the system is continually losing water and then topping itself up, this never settles out. A leak can have the same effect. In fact this is a more likely cause than drawing air into the system via a leaky joint (the water pressure should be positive).