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Very Noisy Central Heating

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from United Kingdom

Joined: 02 Oct 2009
Posts: 69
Location: Cheshire,
United Kingdom

PostPosted: Wed Feb 08, 2012 2:59 pm Reply with quote

I am looking for some advice on how to cure our very noisy central heating system which is driving myself and the whole of the family up the wall (excuse the pun)!!!

The system is a open vented, gravity feed central heating system. It consists of a Glowworm gas fired boiler in the garage, wilo gold circulator pump (replacement for a Grunfos 15/50), Sunvic 3 way motorised valve, HW tank thermostat, sunvic programmer and sunvic programmable room stat.

The circulator and motorised valve are in the airing cupboard upstair with the hot water tank.

The noise starts when the heating (or hot water) switches on, the pump starts up and the system sounds loud, once the bolier has heated the water up there is a very large "whoosing" sound in the airing cupboard followed by what sounds like a rush of water through the pipework - if you hold the pipe that feeds up to the pump it instantly gets red hot after this noise has occurred. The note of the pump then changes and it gets louder.

When the system is calling for heating there is a sound of running water in the pipework feeding the radiators and in the radiators themselves there is a bubbling noise that can be heard. I have bleed the radiators and no air escapes just water.

As the system runs the whooshing noise continues and the whole system sounds like it is going to take off!!!

No work has been carried out on the system for about 18 months when the pump and 3 way motorised valve and head where replaced requiring a full drain down. When the system was refilled I was careful to make sure I bleed the system to remove air.

Last time I was in the loft by the f&e tank I noticed there was water coming from the expansion pipe looped over the top of the tank and also noticed a brown scum on the water in the f&e tank.

Airing cupboard is located about our lounge so the noise is very noticable and drives everyone mad when trying to have a quiet night in front of the box.

I have tried to slow the pump down from number 3 (the grundfos was always on 3 since we moved into the house 10 yrs ago) to number 2 and this has made a slight reduction to the noise from the pump but the other noises far outway this.

Any advice or DIY tips would be appreciated. icon_confused.gif
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from United Kingdom

Joined: 09 Apr 2010
Posts: 5923
Location: Hertfordshire,
United Kingdom
Thanked: 834 times

PostPosted: Wed Feb 08, 2012 8:02 pm Reply with quote

Apart from having it power flushed:

You could drain it and refill a few times

Remove rads and put a hose in them not really as effective as a proper flush though.

Another way is to connect the cold main to the cold feed cap the vent
open the drain and push mains pressure through the system

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from United Kingdom

Joined: 18 Jan 2010
Posts: 3
Location: Hampshire,
United Kingdom

PostPosted: Mon Apr 09, 2012 8:33 pm Reply with quote

Hi Wildeman - just looking on here to research our very noisy central heating system (sounds similar to yours with a Potterton boiler - and found your post - I wanted to ask if you got a power flush done and did it cure the problem? We've had at least 3 plumbers look at our system over last couple of years and all made minor changes but system has got more and more noisy and is now very annoying. I can't really afford to keep getting people in but if I knew flushing system would do the trick I would go for it. Hopy your problem has been fixed!
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from United Kingdom

Joined: 05 Jun 2010
Posts: 1664
Location: Shropshire,
United Kingdom
Thanked: 233 times

PostPosted: Tue Apr 10, 2012 8:41 am Reply with quote

There is a layout error in this system. Pumping over is always wrong. It will shorten the life of your heating system. You should get it fixed as soon as you can.
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from United Kingdom

Joined: 26 Jun 2004
Posts: 55121
Location: London,
United Kingdom
Thanked: 3616 times

PostPosted: Tue Apr 10, 2012 9:44 am Reply with quote

Anyone seeing pumping over should immediately stop using the system! It can cause rads to leak within days.

Most pumping over problems are caused by a very hard deposit where the feed joins the heating flow pipe.

This deposit can be so hard that in many cases power flushing will not remove it and cutting out the pipework to mechanically remove it is usually needed. In some cases the pipework can be reinstated using compression couplers.

Pumps should work fine on setting '2' if the system is properly designed.

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