Central Heating

Rads furthest from boiler struggling to heat and constant air in system

Anonymous user 23/02/2024 - 3.24 PM

Been having an issue recently with my central heating. I live in a bungalow with 8 rads. Worcester Bosch greenstar 30i in the loft. The two living room rads are furthest away from the boiler and they barely get warm any more. Both rads are less then 6 months old. If I turn all other rads off, the two living room rads with fire up normally with a gurgle of air (which I bleed out). I can then turn all other rads back on and the heating will work as normal for 2-3 days. After a few days the same problem returns, no heat from living room rads and when I do get them going there is always air in the system. I’ve had an engineer visit to flush the system and balance but still no joy. One thing the engineer noticed was 15mm pipe from the boiler feeding into the first radiator in the system (towel rail in newly refurbed bathroom) and he kind of pushed the emphasis on the bathroom fitters for fitting 15mm pipe rather than 22mm. I’m not sure if that could cause the issue and I’m not sure if the bathroom fitters even messed/changed that pipe work. Any help would be greatly appreciated.