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Thanks for your assistance here Terry. As stated, I will buy and install a pump head and see the results.

Yes, all 10 mm. Ah that thermostat. It is a Drayton Digistat which is located in the hall with the receiver located beside the boiler. Is there a way to check it is working?

Terry, The boiler is located at the back of a ground floor kitchen extension where the 2 small rads that previously heat up to full heat are situated. The pipes from the boiler which are 22mm go up into the loft area above and must come back down to these 2 small rads which use 10mm pipework...

terryplumb Closed the Trvs on the hot rads and now the other rads have only a faint heat. Reverted back to original. Which was, all rads off except the one in our livingroom which although it doesn't get hot enough, at least gives off some heat.

terryplumb Done as you requested and here are the results. Upstairs: All radiators cold. Downstairs: There are 2 small radiators at the back of the house next to the boiler which are really nice and hot. The other 4 larger radiators are cold including the living room which I was getting at...

Other things I have done to try and improve the heating has been to change the valve assembly in the diverter valve because of a small leak and replaced Automatic Air Vent.

terryplumb The upstairs part of the house isn't used very much nowadays so heating hasn't been used apart from heating the upstairs bathroom at a reduced setting in frosty weather. So really can't tell how well it was working. I think what drew my attention to there being a problem was that the...

oldbuffer 1. Pump could be worn and less efficient than when new, but if its circulating OK for upstairs, less likely to be the problem. Yes it is circulating upstairs but I was thinking that it would be easier for the hot water to get there than downstairs. 2. How are the downstairs radiators...

terryplumb I think about 2 weeks ago I was toping up the system and added to much water. Decided to drain some of the excess water from a radiator air vent when I noticed that the water was very discoloured. So decided to drain the sysem down a few times to clean it out. Still dirty with...

With my Potterton Promax Combi HE Plus A, the radiators downstairs don't heat up properly. Upstairs work quite well but when they are turned on the downstairs will not heat up at all. I have removed them and flushed them and also used a cleaner but this hasn't cured the problem. With all...