Have a Gloworm spacesaver 38 vented system 2x2 port valves.
Noticed recently when in CH mode the sound of running water from the boiler like a trickling noise, could this be air in the system?
The noise is not there when boiler running on DHW only mode.
Also a couple of questions about Grundfos pumps.
Is it Ok to change the pump speed when the system is running?
What kind of noise do u get when there is air in the pump ? does it sound like a whirring noise (from the pump)?
Any help please
Noticed recently when in CH mode the sound of running water from the boiler like a trickling noise, could this be air in the system?
The noise is not there when boiler running on DHW only mode.
Also a couple of questions about Grundfos pumps.
Is it Ok to change the pump speed when the system is running?
What kind of noise do u get when there is air in the pump ? does it sound like a whirring noise (from the pump)?
Any help please