B
Blocky
Hi,
Can anyone tell me what might cause intermittent back pressure in a 28mm gravity hot water circuit.
I tends to happen when the central heating (pumped) is on. there is an awful squeal in the pipes then you can hear the bubbling in the attic. It goes on for about 10 - 15 seconds then everything is running normally.
The cylinder stat was replaced a while back & it seems to operate the 'sunvic' valve ok.
The boiler is an old baxi bermuda 552.
The system has been powerflushed recently and the radiators have never been better apart from having to bleed them regular.
Can anyone tell me what might cause intermittent back pressure in a 28mm gravity hot water circuit.
I tends to happen when the central heating (pumped) is on. there is an awful squeal in the pipes then you can hear the bubbling in the attic. It goes on for about 10 - 15 seconds then everything is running normally.
The cylinder stat was replaced a while back & it seems to operate the 'sunvic' valve ok.
The boiler is an old baxi bermuda 552.
The system has been powerflushed recently and the radiators have never been better apart from having to bleed them regular.
