Having problems with the above boiler and British Gas.
Hot water is fine however central heating only heats upstairs radiators.If I isolate upstairs and close all but one of the downstairs ones I get heat in the one thats left.
The boiler does not lockout or discharge through the pressure release valve but seems to fire on low occacsionaly remaining at 80 degrees and 1.5bar.The pump seems to be running as the pressure increases from 1 bar to 1.5 when the boiler is turned on.It is also set at 3.
Have service contract with BG and called the nice people.
Man came and said it needed a powerflush.Strange as I flushed the system this time last year hiring a power flusher and using the appropriate chemicals.
I was out at the time but the misuss tells me that when she told him this the young chap phoned is supervisor to no avail.They maintain it needs pressure flushed.
I then fitted taps to the flow and return pipes and ran mains through them both forwards and backwards each rdiator in turn.Still no joy and not much crap either as would be expected in a sealed system freshly flushed.
A friend suggested microbore may be clogged,so today I cut and capped the downstairs flow and returns under the floor so that only the three downstairs radiators nearest the boiler (which are the ones we use anyway)were being fed by the boiler before replacing the microbore feeding them with 10mm plastic barrier pipe.The radiators are now fed by mini bore via reduction tees on the 22mm flow and returns.I also removed each radaitor and flushed them outside with a hose pipe and replaced lockshields and tvrs to each before I filled and bled the system including the dhw bleed and pump but the dowstairs radiators still dont heat up.There is no external bypass valve fitted to the system.
To my mind the symptoms suggest the water in the boiler must be cycling round the dhw manifold and not reaching the flow and returns to the radiators and that the raditors that are heating are doing so as a result of convection and not pumped water.
Could anyone confirm whether or not Im right and if so suggest what could be causing this effect and how I could prove it to BG to have it fixed.
Any help much appreciated
Thanks
Hot water is fine however central heating only heats upstairs radiators.If I isolate upstairs and close all but one of the downstairs ones I get heat in the one thats left.
The boiler does not lockout or discharge through the pressure release valve but seems to fire on low occacsionaly remaining at 80 degrees and 1.5bar.The pump seems to be running as the pressure increases from 1 bar to 1.5 when the boiler is turned on.It is also set at 3.
Have service contract with BG and called the nice people.
Man came and said it needed a powerflush.Strange as I flushed the system this time last year hiring a power flusher and using the appropriate chemicals.
I was out at the time but the misuss tells me that when she told him this the young chap phoned is supervisor to no avail.They maintain it needs pressure flushed.
I then fitted taps to the flow and return pipes and ran mains through them both forwards and backwards each rdiator in turn.Still no joy and not much crap either as would be expected in a sealed system freshly flushed.
A friend suggested microbore may be clogged,so today I cut and capped the downstairs flow and returns under the floor so that only the three downstairs radiators nearest the boiler (which are the ones we use anyway)were being fed by the boiler before replacing the microbore feeding them with 10mm plastic barrier pipe.The radiators are now fed by mini bore via reduction tees on the 22mm flow and returns.I also removed each radaitor and flushed them outside with a hose pipe and replaced lockshields and tvrs to each before I filled and bled the system including the dhw bleed and pump but the dowstairs radiators still dont heat up.There is no external bypass valve fitted to the system.
To my mind the symptoms suggest the water in the boiler must be cycling round the dhw manifold and not reaching the flow and returns to the radiators and that the raditors that are heating are doing so as a result of convection and not pumped water.
Could anyone confirm whether or not Im right and if so suggest what could be causing this effect and how I could prove it to BG to have it fixed.
Any help much appreciated
Thanks