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Dont think the bubble has gone as the hot water is nice and clean, and I have use the lever on the back of the valve to no avail. Could it be an airlock ? as it bloobs when the boiler fires up and shuts down. No air in the rads as they all are hot and just spurt water when bled Steve

http://img305.imageshack.us/img305/3194/dscn06173ah.jpg http://img356.imageshack.us/img356/3193/dscn0615r6vf.jpg http://img408.imageshack.us/img408/1926/dscn0616r2uo.jpg here you go, looks very dirty with a flash !

Thanks for the replies, not sure what is stopping gravity working but the hotwater return pipe only gets hot with the pump working on CH, so I guessed it must be constricted in some way. The system must be at least 25 yrs old but has been updated to a "C Plan" at some stage adding stats and...

Hi, my hot water over the last year or 2 has taken longer to heat up and never gets to full temp unless the CH pump is working. The problem seems to be sludge or a blockage in the gravity hot water circuit. So I am going to change the cylinder to a indirect coil type and add a F+E for CH and...