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Hi, Am new to this forum so please go easy on me!! 
Am a keen DIYer, completed level 2 plumbing at college some time ago but do not work in the trade.
In the summer i checked out the F&E tank in the loft and noticed it was full of sludge so decided to vac it all out and give it a good clean. Also drained the system down so i could install a new towel radiator in the bathroom. Filled the system and inhibited it. Checked the F&E tank again about a month later and it was filthy again. When the heating fires up and when the pump starts, it pumps over and into the tank for a bit and then stops when the system settles down. The vent is not on the positive side of the pump, the cold feed tees in within 150mm, again on the negative side of the pump. Someone said to me that the cold feed may be blocked which i thought strange as the system fills fine after draining, however, I cut out the pipework and installed a new leg of copper. there was a bit of gunk in the old pipe but certainly not blocked. Had the system cleaned and powerflushed and still it pumps over. I have turned the pump down to speed 2 and it still does it. I raised the vent pipe to 450mm above the f&e tank!!Anyone got any ideas?? Am at a loss of what to try next!?! This was a new build installation in 2003 and may well have been pumping over since day 1 and may be to do with the initial installation. One thing i am not sure of is the air separator that is on the system. The flow from the boiler comes up through the floor into the airing cupboard in 28mm, feeds into the bottom of the air separator, the vent pipe goes out the top in 22mm and the flow to the pump comes off of the side in 28mm. Could the issue be here? Sorry this is a long one but hoping someone can help
Am a keen DIYer, completed level 2 plumbing at college some time ago but do not work in the trade.In the summer i checked out the F&E tank in the loft and noticed it was full of sludge so decided to vac it all out and give it a good clean. Also drained the system down so i could install a new towel radiator in the bathroom. Filled the system and inhibited it. Checked the F&E tank again about a month later and it was filthy again. When the heating fires up and when the pump starts, it pumps over and into the tank for a bit and then stops when the system settles down. The vent is not on the positive side of the pump, the cold feed tees in within 150mm, again on the negative side of the pump. Someone said to me that the cold feed may be blocked which i thought strange as the system fills fine after draining, however, I cut out the pipework and installed a new leg of copper. there was a bit of gunk in the old pipe but certainly not blocked. Had the system cleaned and powerflushed and still it pumps over. I have turned the pump down to speed 2 and it still does it. I raised the vent pipe to 450mm above the f&e tank!!Anyone got any ideas?? Am at a loss of what to try next!?! This was a new build installation in 2003 and may well have been pumping over since day 1 and may be to do with the initial installation. One thing i am not sure of is the air separator that is on the system. The flow from the boiler comes up through the floor into the airing cupboard in 28mm, feeds into the bottom of the air separator, the vent pipe goes out the top in 22mm and the flow to the pump comes off of the side in 28mm. Could the issue be here? Sorry this is a long one but hoping someone can help
