Hi,
I have a central heating system which is a sealed unvented (pressurised) system (Gloworm/RCM cylinder) which is making a continuous noise whilst the pump (Grundfos) is on and running.
I have replaced the pump under warranty, which helped to reduce the noise level..
Now the remaining noise appears to be coming after the pump, the pipe work flowing INTO the cylinder through a one way valve. When you put a screwdriver against the pump/pipe to listen to the vibrations it is sounding quite, but 1 foot later the same pipe & one way valve connecting to the cylinder is where the noise seems to be coming from. (the flow into the cylinder)
The one way valve into the cylinder is a sealed unit, is it possible some sort of dirt is in the way causing the noise, is it worth flushing the system, or replacing the valve?
I notice now that when a tap is on running hot water the noise goes away, but the minute the tape is off, it comes back...
The system was newly installed with Fernox in Nov 2004. If I reduce the speed of the pump to setting 1 it does help.
I have tried bleeding the air from the pump when you turn it off & on, no change....it still seems to be from the one way valve/pipe.
Any ideas?
Dave
I have a central heating system which is a sealed unvented (pressurised) system (Gloworm/RCM cylinder) which is making a continuous noise whilst the pump (Grundfos) is on and running.
I have replaced the pump under warranty, which helped to reduce the noise level..
Now the remaining noise appears to be coming after the pump, the pipe work flowing INTO the cylinder through a one way valve. When you put a screwdriver against the pump/pipe to listen to the vibrations it is sounding quite, but 1 foot later the same pipe & one way valve connecting to the cylinder is where the noise seems to be coming from. (the flow into the cylinder)
The one way valve into the cylinder is a sealed unit, is it possible some sort of dirt is in the way causing the noise, is it worth flushing the system, or replacing the valve?
I notice now that when a tap is on running hot water the noise goes away, but the minute the tape is off, it comes back...
The system was newly installed with Fernox in Nov 2004. If I reduce the speed of the pump to setting 1 it does help.
I have tried bleeding the air from the pump when you turn it off & on, no change....it still seems to be from the one way valve/pipe.
Any ideas?
Dave