Hello all I have a Circulation problem with my vaillant boiler installed in 2012. It’s not that old. It was working Fine, never brilliant up to about September time when one by one I started upgrading radiators from the old single panel to type22 kudox with Drayton bi directional valves. Just to improve system. The first was changed in September the last was changed 2 weeks ago. In between there have been flushed from lowest point with x800 and magna clean installed.
My problem is that gradually fewer and fewer radiators work. The ones furthest from radiator don’t even get like warm. The nearest get hot then cool down. Up to about two weeks ago they got really hot.
So I know I have a circulation problem. When the boiler starts up it pushes out from flow at high temperature rising to 75..78.79 80 then lock out
the flow goes into 22 then 28mm pipes that branch off into 15mm at the radiators. 28mm continues for about 10 meters on first floor then turn down to landing and lower levels on ground floor for the other 5 radiators. (There are 11 in total. The first 3 or 4 radiators get reasonably hot very slowly but after about 5 min the flow reaches temperature and cuts out then starts up again this takes an hour before you start feeling heat in the first 3 radiators.
there is no return. It’s stone cold. After about 2 hours it’s slightly Luke warm to touch but never more.
So British Gas came said faulty pump put new one on but nothing. Then said do power flush as blockage on system but I changed pipes and nothing. Ran mains water with 15mm speedfit connected to bath taps down all pipes and no blockage. Ive obviously balanced turned off rads, focused on a couple rads at a time by closing all others from both trv and ls but there’s no difference.
So the fault must be in boiler. The magna filter is hardly dirty the canoe filter in flow pipe is not bad. Bit dirty but not caked now cleaned. The pump is new. The heat exchanger is not noisy and hot water works perfect so shouldn’t be blocked. X800 has been down 4 times left for 48 hours each time but no difference.
Bg day system sludges and heat exchanger blocked so £800 for power flush and then they will deal with it but I think that’s unfair as I pay 65 a month for last ten years and they installed the boiler in 2012. I’ve pointed out it could be diverter valve but they didn’t even bother looking. Any ideas anybody?
My problem is that gradually fewer and fewer radiators work. The ones furthest from radiator don’t even get like warm. The nearest get hot then cool down. Up to about two weeks ago they got really hot.
So I know I have a circulation problem. When the boiler starts up it pushes out from flow at high temperature rising to 75..78.79 80 then lock out
the flow goes into 22 then 28mm pipes that branch off into 15mm at the radiators. 28mm continues for about 10 meters on first floor then turn down to landing and lower levels on ground floor for the other 5 radiators. (There are 11 in total. The first 3 or 4 radiators get reasonably hot very slowly but after about 5 min the flow reaches temperature and cuts out then starts up again this takes an hour before you start feeling heat in the first 3 radiators.
there is no return. It’s stone cold. After about 2 hours it’s slightly Luke warm to touch but never more.
So British Gas came said faulty pump put new one on but nothing. Then said do power flush as blockage on system but I changed pipes and nothing. Ran mains water with 15mm speedfit connected to bath taps down all pipes and no blockage. Ive obviously balanced turned off rads, focused on a couple rads at a time by closing all others from both trv and ls but there’s no difference.
So the fault must be in boiler. The magna filter is hardly dirty the canoe filter in flow pipe is not bad. Bit dirty but not caked now cleaned. The pump is new. The heat exchanger is not noisy and hot water works perfect so shouldn’t be blocked. X800 has been down 4 times left for 48 hours each time but no difference.
Bg day system sludges and heat exchanger blocked so £800 for power flush and then they will deal with it but I think that’s unfair as I pay 65 a month for last ten years and they installed the boiler in 2012. I’ve pointed out it could be diverter valve but they didn’t even bother looking. Any ideas anybody?