DIYnot
Local | Network
   DIYnot > Forums
Local | Network
DIYnot Network Local DIYnot Network Local  
  Forum IndexForum Index     RulesRules    HelpHelp     Join FREERegister Free     About CookiesCookies     SearchSearch     LoginLogin 

Banging radiators

Goto page 1, 2  Next
 
Post new topic   Reply to topic    DIYnot.com Forum Index > Plumbing and Central Heating
Search this topic :: View previous topic :: View next topic  
Author Message
chezzer0361

from United Kingdom

Joined: 29 Oct 2006
Posts: 255
Location: Lancashire,
United Kingdom

PostPosted: Mon May 07, 2007 6:37 pm Reply with quote

3 of the radiators in the house keep banging when they are starting to cool down.

Live in a 3 bed terrace so I don't think I need to go into detail but the kitchen one and the bedroom radiators all bang, the combi boiler is under the stairs by the way.

It is driving me insain, tried bleeding them, and as soon as you turn the nut the water comes out so no air lock................

So why do they bang so much, it usually starts after they have been one for about an hour and goes on till you turn the thermostat down, then again when they are cooling down to go off.

Any ideas would be very much appreciated, before I rip the bloody things off the wall and get economy 7 instead................. icon_mad.gif
Back to top
 Alert Moderators

If you do not want to see this advert, click here to login or if you are new click here to join free.
gas4you

from United Kingdom

Joined: 23 Feb 2007
Posts: 17605
Location: Norfolk,
United Kingdom
Thanked: 747 times

PostPosted: Mon May 07, 2007 6:40 pm Reply with quote

Have you got bi-directional trv's fitted? You can check by looking at them and seeing if they have 2 arrows on them.

If onl 1 arrow on them they may be installed the wrong way round.
Back to top
 Alert Moderators
Richsoft

from United Kingdom

Joined: 29 Apr 2007
Posts: 27
Location: Berkshire,
United Kingdom

PostPosted: Mon May 07, 2007 6:42 pm Reply with quote

What make of combi is it and what does the pressure gauge say on the boiler?
Back to top
 Alert Moderators
chezzer0361

from United Kingdom

Joined: 29 Oct 2006
Posts: 255
Location: Lancashire,
United Kingdom

PostPosted: Mon May 07, 2007 6:49 pm Reply with quote

there is just one arrow on the TVR thing

It is a Baxi Combi Boiler 105HE and the pressure gauge is just below 1
Back to top
 Alert Moderators
gas4you

from United Kingdom

Joined: 23 Feb 2007
Posts: 17605
Location: Norfolk,
United Kingdom
Thanked: 747 times

PostPosted: Mon May 07, 2007 8:18 pm Reply with quote

when the rads are cold, turn the heating on and the pipes that get hot first will be the flow. Does the arrow correspond to the direction of the hot water flow through the rads?
Back to top
 Alert Moderators
chezzer0361

from United Kingdom

Joined: 29 Oct 2006
Posts: 255
Location: Lancashire,
United Kingdom

PostPosted: Tue May 08, 2007 7:52 am Reply with quote

sorry don't understand, there is one arrow on the tvr and numbers 1 to 5. On the pipe things there is a white cap with a arrow saying forward and back and + and -.........................

Not used to central heating had economy 7 for 10 years, now got central heating and haven't got a clue how to work it................lol

I expected to ( like my mums house ) if it was cold go to the hall and turn the thermostat up, done, but my new system isn't like that even................so I apologize if I sound blonde...................... icon_rolleyes.gif
Back to top
 Alert Moderators
werewolf

from United Kingdom

Joined: 23 Apr 2007
Posts: 144
Location: Cheshire,
United Kingdom

PostPosted: Tue May 08, 2007 12:04 pm Reply with quote

When a rad starts banging go turn the trv upto the next number or 2

.Does the banging stop?
Yes?
Ergo, faulty trv or most prob fitted at wrong end of rad.
Back to top
 Alert Moderators
chezzer0361

from United Kingdom

Joined: 29 Oct 2006
Posts: 255
Location: Lancashire,
United Kingdom

PostPosted: Tue May 08, 2007 2:53 pm Reply with quote

yes the banging stops until the radiator heats up again, then banging starts again when it is cooling down again...................the one in the kitchen is the worst it bangs like a jack hammer, well it sort of throbs. It is worst when it is due to go off, i.e. the heating goes off at 9am so from about 8.30 the banging starts.

So she I get new TVR or change them to the other end of the radiator, is there a rule on which end they all seem to be, as you look at the radiator they are all on the right hand side........................
Back to top
 Alert Moderators
gas4you

from United Kingdom

Joined: 23 Feb 2007
Posts: 17605
Location: Norfolk,
United Kingdom
Thanked: 747 times

PostPosted: Tue May 08, 2007 5:43 pm Reply with quote

Right hand side is usual but not mandatory. You can remove valve and just turn it around on the same end if you have room for the head to poke out sideways icon_wink.gif
Back to top
 Alert Moderators
somnerd13

from United Kingdom

Joined: 31 Jan 2007
Posts: 30
Location: Worcestershire,
United Kingdom

PostPosted: Tue May 08, 2007 9:08 pm Reply with quote

We had this, and had everything suggested, air in the system, pressure to high, pressure to low, etc etc. One day I went to sort it on my own and I found the radiator that was causing it - turned out it was because the control knob for the TRV had come very lose. Tighened it up and it hasn't happened since. The banging was absolutely unbelieveably loud and at times vibrated to other radiators on the other side of a very big house!
Back to top
 Alert Moderators
chezzer0361

from United Kingdom

Joined: 29 Oct 2006
Posts: 255
Location: Lancashire,
United Kingdom

PostPosted: Wed May 09, 2007 2:42 pm Reply with quote

will try that, I will try anything, it was banging away for about 1 hour this morning, i just could not be bothered getting out of bed, when I did the radiators where cold upstairs and warm downstairs...........

I think I need to get someone out to it, before I rip the thing off the wall.

Also the pressure has dropped to just below 1, it is usually between 1.5 and 2, does it drop in Summer ?????? do I need to get it back up to 1.5 ???
Back to top
 Alert Moderators
gas4you

from United Kingdom

Joined: 23 Feb 2007
Posts: 17605
Location: Norfolk,
United Kingdom
Thanked: 747 times

PostPosted: Wed May 09, 2007 6:06 pm Reply with quote

If pressure is dropping could ponit to another fault in boiler, or do you mean it is 1Bar cold and 1.5Bar when rads hot. If so this is normal icon_wink.gif
Back to top
 Alert Moderators
chezzer0361

from United Kingdom

Joined: 29 Oct 2006
Posts: 255
Location: Lancashire,
United Kingdom

PostPosted: Thu May 10, 2007 9:46 am Reply with quote

it is at just under 1 bar on the pressure gauge all the time. In winter it was at 1.5..................

We turned off the radiator in the kitchen last night because it was so bad and noisey and this morning the radiator in the lounge which is usualy luke warm was really hot ???? So I think the problem lies with the kitchen one this is parellel to the boiler.

The towel rail in the bathroom get's so hot it nearly burns your hand, this is locted directly above the boiler ???????
Back to top
 Alert Moderators
chezzer0361

from United Kingdom

Joined: 29 Oct 2006
Posts: 255
Location: Lancashire,
United Kingdom

PostPosted: Mon May 14, 2007 3:07 pm Reply with quote

gas4 you.....................


turned off the radiator in the kitchen and no banging, so stupid question but, this is obviously where the problem lies, it doesnt need bleeding, so what else would you suggest I do............


Many Thanks, and I will not ask any more questions after this one................... icon_lol.gif
Back to top
 Alert Moderators
gas4you

from United Kingdom

Joined: 23 Feb 2007
Posts: 17605
Location: Norfolk,
United Kingdom
Thanked: 747 times

PostPosted: Mon May 14, 2007 6:49 pm Reply with quote

Replace kitchen trv with new bi-directional one icon_wink.gif
Back to top
 Alert Moderators
Search this topic :: View previous topic :: View next topic  
Post new topic   Reply to topic    DIYnot.com Forum Index > Plumbing and Central Heating All times are GMT
Goto page 1, 2  Next
Page 1 of 2

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
Similar Topics   Replies   Views   Posted 
BANGING PIPES AND RADIATORS 12 5720 Sun Apr 24, 2005 12:07 pm
My Radiators are banging help! 5 140 Mon Dec 16, 2013 4:54 pm
Banging boiler - cooling radiators 4 420 Tue Feb 10, 2009 6:08 pm
Central Heating - Loud banging sound in radiators 2 800 Tue Dec 22, 2009 9:21 pm
Upstairs radiators start banging after a while 16 960 Mon Apr 04, 2005 11:49 pm


 
DIYnot
Find an Expert | Find a Supplier | Search DIYnot.com
Network | Advertising | Newsletter
DIY | DIY How To | @home | DIY Wiki | DIY Forum
By using this site you agree to our Terms of Service / Disclaimer.
Please read our Privacy Policy. Copyright © 2000-2014 DIYnot Limited.