I will give a quick run down of set up then explain the problem.
Terraced house, combi fitted upstairs in bedroom. 3 rads upstairs, 6 down (was four added 2) boiler approx 3-4 years old. Hot water works fine and so does the central heating upstairs.
Trouble is the rads downstairs hardly get hot, well only about half as hot as the ones upstairs. Ive turned the ones off upstairs and all this does is shuts the boiler down quicker i e getting to its maximum heat quick and knocking off. I even swapped all trvs and lockshields and flushed the system hot and cold, ive also checked the manifold downstairs which seems clear. (all pipework 8 or 10mm)
The boiler seems to go up in pressure to say 2.5 bar.
Any tips, the only other thing i can see a problem is from the boiler its running away in 22mm to i assume an upstairs manifold then down stairs to another manifold. But on inspection ive found between this 22 from upstairs to downstairs theres a section of 15mm. Now my only thoughts are that this piece of 15mm is causing a restriction and the central heating water isnt getting to downstairs quick enough thus raising pressure and not circulating to downstairs.
Any advice would be great, im a RGI and the property is my mothers but im at a loss to find the problem. Only thing i was gunna try next was to replace the piece of 15 mm with 22 and add a magnaclean in case any other debris stopping it from getting to downstairs rads.
Terraced house, combi fitted upstairs in bedroom. 3 rads upstairs, 6 down (was four added 2) boiler approx 3-4 years old. Hot water works fine and so does the central heating upstairs.
Trouble is the rads downstairs hardly get hot, well only about half as hot as the ones upstairs. Ive turned the ones off upstairs and all this does is shuts the boiler down quicker i e getting to its maximum heat quick and knocking off. I even swapped all trvs and lockshields and flushed the system hot and cold, ive also checked the manifold downstairs which seems clear. (all pipework 8 or 10mm)
The boiler seems to go up in pressure to say 2.5 bar.
Any tips, the only other thing i can see a problem is from the boiler its running away in 22mm to i assume an upstairs manifold then down stairs to another manifold. But on inspection ive found between this 22 from upstairs to downstairs theres a section of 15mm. Now my only thoughts are that this piece of 15mm is causing a restriction and the central heating water isnt getting to downstairs quick enough thus raising pressure and not circulating to downstairs.
Any advice would be great, im a RGI and the property is my mothers but im at a loss to find the problem. Only thing i was gunna try next was to replace the piece of 15 mm with 22 and add a magnaclean in case any other debris stopping it from getting to downstairs rads.