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I'm still wondering what to do. The worst of the noise has stopped, but I know its still not right. Think I'll go for the DS-40 option, unless dismantling your boiler is easy? I could do it I imagine its just getting a CORGI GF to certify its when its back together. It does seem to be low...

Woah, that looks pretty terminal. With the flushing thing its a case of time, effort and inexperience. The DS-40 would be quicker and cheaper, the powerflush more expensive and time consuming, but you know it will clear it out. Be nice to know if I need to bother. I definately have a flow...

Not an awful lot of muck came out, mainly black dirty water after the original Chem clean. All the rads get hot, and relatively quickly. If I powerflush the HE its all 22mm pipe, so that should work shouldn't it? Or would you advocate another DS-40 clean? Regards, Bigsul.

Yeah the lack of flow was probably caused by me and my 'Additives'. I'm kicking myself now. I'm monitoring it at the moment as the chuffing has died down a bit. Still there, but not as violent, there was a loud bang earlier and like I said it died down. Can still hear a trickling through the...

Pump is a brand new Grundfos a rated 15-60. I had a lot of vibration, changed pump, solved. I did have a noisy boiler (kettling), cleaned with Fernox DS-40, noise stopped. Had a new 2 panel rad fitted in lounge, in place of 1 panel. Leaky pipe to rad so I drained cleaner out and...

Its a Myson Economist WM 40/50 BF. Its only started doing this since I drained it down 4 times and then put all the additives in. Regards, Bigsul.

Okay. Took out the pump and 3 way valve, all clear. Feed and vent pipes all clear. From cold, turn on heating and/or hot water. After about 10 minutes boiler starts to chuff like a train. Quiet at first then gets louder until pipes start to vibrate in airing cupboard. Then calms down and...

I have tried cycling the pump speed, but it doesn't seem to help. I'm going to do some investigating tonight. I have no manual vent near the cylinder. I'll let you know what I find. Bigsul.

True, but I'm not a plumber, what I meant was some symptoms can often point to a number of causes. Any ideas on my problem? Bigsul.

LOL, no I used water too. I can see what your saying, I've been checking it out today and when the system is cold it seems okay. After a certain amount of time the boiler starts to chuff (like a train), this gets louder until it turns into banging and shaking. Then I cycle the pump speed...

Hi, Been hanging around reading, but now I need to post. Cleaned my CH & HW system out with DS-40 last week, drained and flushed 4 times yesterday. All was well. On the final fill up I put in Fernox MB-1, Fernox Boiler Noise Silencer and Fernox Leak Sealer. :? At 4am this morning the...