Brand new noisy CH water pump

[Shuggieg]

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[TD="class: alt1, bgcolor: #F1F1F1"]Hi

Recently had a new WILO Gold RS50 water pump installed by registered fitter. The pump makes a loud gurgling sound when running, sounds like air and water being stirred up. Have bled the radiators and the bleed screw on the pump several times. Also a small vent at top of pipe on join between pump and tank. Only a small amount of air coming out of 2 upstairs radiators but pump still noisy. The noise reverberates around the house and is quite intrusive. Called the fitter out again to look at it but he says it is just system noise and we have to live with it. He has already power flushed the boiler and fitted a filter to catch any debris in the system. He says the only thing left to do is power flush the whole system (at a cost of £400) and says there is no guarantee of it getting rid of the noise. Read several forums where the answer is replace an old pump but this one is brand new! Any suggestions please?
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[Shuggieg]

3 weeks is a long time to see no improvement. Is it an open vented system? My guess would be it's pumping over and oxygenated water is entering the system. Either that or you have a leak somewhere.

It is an open vented system

If it is open vent, get to the f/e tank and watch it as someone else turns the heating on, then watch it some more as the heating gets to temperature. If your system is sound there should be little or no activity up there.

Did as you suggested. Watched while system switched on then for another 15 mins till system fully up and running with pump making its usual gurgling sound. But no activity in the F&E tank. Also checked that the vent pipe meets the spec in the instruction manual for the Glowworm 18xi system.

Should I be looking for a leak in the system now?

Thanks again for your time and your input.
Regards
Hugh

 

[southcoastboile]

What boiler is it? you could combine the cold feed and open vent.

 

[Shuggieg]

What boiler is it? you could combine the cold feed and open vent.

Its a Glowworm 18xi

RGDS
Hugh

 

[JCplumb]

The problem could be a leak, but to be honest it's difficult to diagnose without being there.
A pressure test would detect a leak which is something a plumber could do for you, how long it would take and how much it would cost is anyones guess. I'd phone a few local plumbers for quotes. Or post on here in the plumber wanted section.

 

[zzzjim]

looking for a leak in the system now

The leak in question , (when off) may not let much water out , if any but be big enough that when pump pulls water along , air gets dragged in as well !