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PostPosted: Fri Apr 27, 2018 9:35 pm 
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I originally posted this on another forum two years ago but never got a reply, eventually forgot about it and lived with the issue, although it is slowly getting worse (see below ref frequent rad bleeding). I'm a tenant and my landlord took out the British Gas Landlords HomeCare cover. A couple of weeks the central heating stuck on all the time, I tracked it down to the actuator for the diverter valve as I found it was sticking over on manual, a few wiggles and it would work its way back to Auto again.

Called BG and let them know what the issue was and also reported the air in the pipes from the boiler, engineer came out ans replaced the actuator but noted "Couldn't fault on visit", probably because the central heating has been turned off all week due to the hot weather. He also noted that "no noise was heard, normal noise operation", yet when the boiler is on it's possible to hear the rushing of bubbles up through the pipes and through the pump ... from every room in the house.

Over the winter I've had to frequently bleed the radiators upstairs and always air comes out, especially from the bathroom which can take a good few seconds until water comes out, and is sometimes followed by a glugging/bubbling noise through the pipes. The water coming out is black and smells like iron/rust.

Does this sound like the system needs a flush and heat exchanger needs descaling?



Below is what I wrote two years ago:


I have the most annoying noises coming from my heating system. I'll put as much info below as possible, I hope someone can guide me in the direction of a solution :)

I have a Potterton Prima 30F combi boiler on an open vented system. Here is whats happening... when the programmer comes on the pump starts and the boiler fires up, theres a lot of bubbles heading up from the boiler which make a load of noise as the hit the pump. From then as long as the pump is running regardless of if the boiler is alight, there is a watery noise from the pipes at the boiler and occasional glugging and the noise at the pump of the air going through it.

I've tried a few things to fix this, with my limited knowledge (and the internet), first was to turn the central heating on and bleed the radiators, a little air came out but nothing spectacular. Second was to bleed the valve at the high point in the airing cupboard, no air, just hot water. Third it was suggested to try adding Sentinal X200 noise reducer to the system (through rad in bathroom, have run up the C/H a couple of times to circulate fully), the aim to make sure there was no scaling in the boiler. However the problem persists :(

I've added some pics, and a couple of videos to try and help... whats the next thing to try? Its driving me nuts!

Thanks in advance.


Noise at pump:


Noise at boiler:


Noise with boiler fired:


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PostPosted: Fri Apr 27, 2018 10:43 pm 
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Can’t really tell from the pics, but my first impression is that it’s not piped up properly.

Can you post more pics of the pipe work up to the pump, in fact more of the pipe work generally, not too close as it would help to see it all in the vicinity of the pump and valve

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PostPosted: Mon May 07, 2018 10:35 pm 
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Sorry for the slow reply, been a busy few days.
I'm just uploading another video now from this morning in which the noise can be heard quite well, it's definitely worse in the morning and evening ... it's been going continually for about an hour and a half tonight as I'm typing this.

Noise:


Vid of pipework:


Few pics of pipework below:


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PostPosted: Tue May 08, 2018 10:31 pm 
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Vid from this morning so you can hear the air glugging up the pips and then going through the pump:



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