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Tapping noise when heating is on, is it a leak?

15
Found 30th Oct 2014
I have a unvented cylinder and a external Worcester boiler with good water pressure to the house naturally. I have a new system of 4 years which has plastic piping through the house. I have noticed for the first time in 4 years that (now I have turned the heating back on this autumn) there's this tapping noise coming through a false wall, where I no full well a lot of pipes run from down stairs to up or the other way round. Could the sound simply be the pipes heating up and moving, possibly moving within clip that hold them? There is no noise when the heating is off. I assume as the system is pressurised it would leak even when off. Why can I only hear it with the heating on? I have turned it on for the second time just now and its doing the same been on an hour still doing it. No sign of damp but its behind a false wall on ground level and I have tiled floor and high tiled skirting so it might be hard to tell?
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15 Comments
It could be air trapped in the pipe. Are there any release valves you could vent?
Original Poster
I don't know what to look for to be honest? I only know the ones on the rads (bleeding)? maybe I should google what one would look like? I haven't bled the rads to be honest either.
bleeding the radiators should help
It's called "expansion"
Remember that with an unvented system, if you bleed the rads you may need to top up the system - make sure you know how to top the system up before bleeding.

Do you hve a pressure gauge? If there is a leak you will be losing pressure.

TBH I'd guess that it is just thermal movement and nothing to be concerned about.
Original Poster
Well a plumber has to come round to fix a trap at some point it may be worth asking him, as I think the whole system is unbalanced since day one as some rads don't heat properly, I have had some people who are useless look at it I think I will have someone proper come and look, and re balance the system or what ever.

Thanks for your thoughts much appreciated I was really worried and concerned to put the heating on tbh fell better now.

Also think my expansion vessel has not worked since day one. As one guy came and loosened the screw at one end and water came out, thats the end the air is supposed to be so it pressurised, he guy hadn't a clue and said its fine, I have since been told it isn't but I can't see how the system can run efficiently without a working expansion vessel for 4 years?

Edited by: "potatokid" 30th Oct 2014
potatokid

Well a plumber has to come round to fix a trap at some point it may be … Well a plumber has to come round to fix a trap at some point it may be worth asking him, as I think the whole system is unbalanced since day one as some rads don't heat properly, I have had some people who are useless look at it I think I will have someone proper come and look, and re balance the system or what ever.Thanks for your thoughts much appreciated I was really worried and concerned to put the heating on tbh fell better now.Also think my expansion vessel has not worked since day one. As one guy came and loosened the screw at one end and water came out, thats the end the air is supposed to be so it pressurised, he guy hadn't a clue and said its mine, I have since been told it isn't but I can't see how the system can run efficiently without a working expansion vessel for 4 years?


Some boilers have a built in expansion vessel other have something called pump over run. The only expansion vessel I have is on my heat store which is attached to a mixer. But that's a vented heatstore system. My boiler contains it's own expansion vessel so I can turn the boiler on a off without any issues.
our radiators do this but not a leak problem. just horses for courses.
I have had one radiator of thirteen that likes to make himself heard.
This was before the new boiler went in and after.
I think some radiators have bigger personalities than others but we love him for it.
Unless heating is affected or plasterboard is falling off the walls it's so wet I wouldn't be overly concerned.
Will
Not a plumber.
Edited by: "willhay555" 30th Oct 2014
Original Poster
Thanks everyone for your thoughts and comments
You will have to bleed the whole system properly to get all radiators working at 100% and to stop the hammering.
Original Poster
I'll be happy if its only that
I had similar when I moved in to the house I'm in now. I put up with it for years but it drove me crazy. Late at night... Heating on... Every few minutes I'd get a tapping/knocking noise from one particular area. It would start slow (tap... Tap... Tap...) then build up and get faster (taptaptaptap) before stopping for a few minutes, then starting again.

I guessed it was expansion of the pipes against the floorboards every time they heated up. I lifted the floorboards in that area and found a pipe or pipes (I forget now, it's been a while) ran over the top of a joist (where a small amount had been cut away to accommodate the pipes.) I wrapped the pipe with suitable material... Replaced the floorboards and carpet, and haven't had any problems since.
Original Poster
northeastkev

I had similar when I moved in to the house I'm in now. I put up with it … I had similar when I moved in to the house I'm in now. I put up with it for years but it drove me crazy. Late at night... Heating on... Every few minutes I'd get a tapping/knocking noise from one particular area. It would start slow (tap... Tap... Tap...) then build up and get faster (taptaptaptap) before stopping for a few minutes, then starting again. I guessed it was expansion of the pipes against the floorboards every time they heated up. I lifted the floorboards in that area and found a pipe or pipes (I forget now, it's been a while) ran over the top of a joist (where a small amount had been cut away to accommodate the pipes.) I wrapped the pipe with suitable material... Replaced the floorboards and carpet, and haven't had any problems since.



Bet you wished you had done that sooner it does sound like my noise to be honest, feel like we are playing "Name that sound" or a radio stations secret sound competition I think as mines behind a wall it will be staying there as is

Edited by: "potatokid" 30th Oct 2014
potatokid

Bet you wished you had done that sooner it does sound like my noise to … Bet you wished you had done that sooner it does sound like my noise to be honest, feel like we are playing "Name that sound" or a radio stations secret sound competition I think as mines behind a wall it will be staying there as is

potatokid

Bet you wished you had done that sooner it does sound like my noise to … Bet you wished you had done that sooner it does sound like my noise to be honest, feel like we are playing "Name that sound" or a radio stations secret sound competition I think as mines behind a wall it will be staying there as is



Yep, wish I'd done it years earlier! Was one of those jobs I kept forgetting about and never seemed to get round to sorting.

Took me all of 20 minutes in the end!!

Anyhow, hope you get it sorted... But yeh a bit trickier it being behind a wall.
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