Clunk and scraping noise


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Old 02-19-13, 07:14 PM
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Clunk and scraping noise

I
have a Glowwor
I have a Glowworm Swiftflow 100 combi boiler. It makes a loud clunk and scraping noise, on average about once or twice a day. I have uploaded it to YouTube. The sound I am talking about starts about 20s into the recording, but I have left the preceeding boiler noises in the recording to help with diagnosis. After the noise, the boiler fires up on full flame.

I have a Glowworm Swiftflow 100 combi boiler. It makes a loud clunk and scraping noise, on average about once or twice a day. I have uploaded it to YouTube. The sound I am talking about starts about 20s into the recording, but I have left the preceeding boiler noises in the recording to help with diagnosis. After the noise, the boiler fires up on full flame.
Can anyone tell me what the noise is?
Thank you


Read more:Clunk and scraping noise - DIYnot.com - DIY and Home Improvement

http://www.youtube.com/watch?v=MpeRYnhPuPU

Can anyone tell me what the noise is?
Thank you

Read more:Clunk and scraping noise - DIYnot.com - DIY and Home Improvement
 
  #2  
Old 02-19-13, 07:54 PM
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Since most of us here are from the States.....those units are a little foreign to us. I listened to that video over a dozen times.......weird.

Do you mean that the boiler is not fired up until after that loud noise at +/- 25 seconds ?



It actually sounds like it's lighting at 5 seconds and the heat exchanger is resonating. Then at 25 seconds..... possibly air in boiler.....sounds almost like the water is boiling or building up pressure rapidly and releasing it.
 
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Old 02-20-13, 07:07 AM
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No, you're right. It sounds like the boiler is firing a few seconds into the recording. It sounds to me like metal scraping on metal.
 
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Old 02-21-13, 01:13 AM
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There may be a heat extraction baffle in the burning chamber that has become loose.

I read comments on that other site. Yes there is a draft inducer blower but the noise doesn't soumd like any kind of fan noise.

Are there access covers you can remove for more of a visual inspection ?
 

Last edited by PJmax; 02-21-13 at 01:31 AM. Reason: additional question
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Old 02-21-13, 08:23 AM
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There is nothing that will allow you to look inside the burning chamber.
 
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Old 02-21-13, 08:49 AM
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I was looking at the install/user manual for your unit and there are few moving parts.

I can't figure out what is making that noise.

I'm trying to figure out if I have the proper unit shown in the link. I didn't see any mention of a Swiftflow model.

http://www.glow-worm.co.uk/stepone/d...ercombi100.pdf
 
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Old 02-21-13, 10:25 AM
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The one you have is not correct. This is the one:
http://www.ultimatehandyman.org/PDF/...-313-08-07.pdf
Thanks
 
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Old 03-04-13, 03:53 AM
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Thank you PJMax. Your comments were very enlightening. It did turn out to be kettling. I think you absolutely nailed it with your interpretation of the recording. I can hear it myself now - all the fizzing sounds. It was caused by a faulty flow switch. I wonder if the pressure relief valve could have been responsible for one of those loud noises.
 
 

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