S
Smith99
Hi, hope someone can advise please.
I have had fitted a new new Grundfos replacement pump to my central heating system. This was a like for like replacement. The boiler (Worcester Bosch) is approx 3 years old. The problem is when I have the pump on no. 2 3 speed settings, it sounds like a washing machine, very noisey, lots of wooshing and gurgling.
I've bled the radiators for the last 3 or 4 days but it doesn't seem to be getting any quieter. Also, I have noticed that as there is so much air (I presume) in the system, air/water is re-entering the header tank in the loft and as a result is causing water to rise in the tank and going out of the overflow pipe in the loft into the back garden. I can see the water bubbling in the header tank and it is also quiet warm.
As I mentioned, I have bled a lot from all the radiaors (lots of air) and also from the central screw in the pump (no air from here). The only way I can make the pump quieter and stop the water going out of the overflow pipe is to turn the speed setting down on the pump to 1 (the slowest). The central heating and water still seem to heat satisfactorily but am puzzled why I am having to run the pump on the slowest setting, when the original ran perfectly ok on speed 3.
I've checked and the pump is definitely fitted the correct way, i.e pump and vent screww vertically with the water flow arrow on the pump pointing upwards.
Is it just something that will settle down in a couple of weeks? Each time Iturn up the speed of the pump, the noise starts again and the water starts to drip out of the overflow within a few minutes.
Any advice would be much appreciated.
Thanks.
I have had fitted a new new Grundfos replacement pump to my central heating system. This was a like for like replacement. The boiler (Worcester Bosch) is approx 3 years old. The problem is when I have the pump on no. 2 3 speed settings, it sounds like a washing machine, very noisey, lots of wooshing and gurgling.
I've bled the radiators for the last 3 or 4 days but it doesn't seem to be getting any quieter. Also, I have noticed that as there is so much air (I presume) in the system, air/water is re-entering the header tank in the loft and as a result is causing water to rise in the tank and going out of the overflow pipe in the loft into the back garden. I can see the water bubbling in the header tank and it is also quiet warm.
As I mentioned, I have bled a lot from all the radiaors (lots of air) and also from the central screw in the pump (no air from here). The only way I can make the pump quieter and stop the water going out of the overflow pipe is to turn the speed setting down on the pump to 1 (the slowest). The central heating and water still seem to heat satisfactorily but am puzzled why I am having to run the pump on the slowest setting, when the original ran perfectly ok on speed 3.
I've checked and the pump is definitely fitted the correct way, i.e pump and vent screww vertically with the water flow arrow on the pump pointing upwards.
Is it just something that will settle down in a couple of weeks? Each time Iturn up the speed of the pump, the noise starts again and the water starts to drip out of the overflow within a few minutes.
Any advice would be much appreciated.
Thanks.
