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A bit more info. I tried setting the pump to a slower speed - it was on 2 so I set it to 1. This didn't seem to solve the problem and the radiators took a lot longer to heat up - so I've put it back to 2. The vent pipe and the feed from the header tank both seem to tee into the flow pipe...

Hi The vent pipe goes into the loft and is above the header tank. I'm not sure about the feed - could you give me some guidance on what I sould be looking for. Thanks again l_g

Thanks for the replies. Today I went round bleeding the radiators and decided to test each one for hydrogen - using the upturned glass technique. The first few did nothing when I tested the gas - which is what happened the last time I tested. What surprised me was that when I tested the gas...

Thanks for those suggestions. I should have said that I drained the system, and used a sludge remover to clean it out. I refilled it and used sentinel inhibitor. It looks like the radiators have been replaced recently - so could it be a rad valve need tightening up? I can't see any signs...

Hi, We moved house in the summer and obviously now are using the central heating. However I find we need to bleed the radiators every week - and when the system is on you can sometimes hear the air going through the pipes, radiators and gurgling in the pump. I've done a search and found lots...