Clunking Heating System

[mandyp]

Off the top of my head I'm at work right now, it's a Baxi 105e and yes we do have TRVs fitted (something else that we've done....could that be the cause?)

Will get Allan to check the pipe from the boiler.

 

[noodlz]

Might be trv's...check when it's making the noise, if adjust trv setting does it stop?

Some trv's can be put on either way, others have to put only in direction of flow (should have an arrow on them)...if they're put on the wrong way round can cause a hammering noise.

Check out this link:

http://www.extra.rdg.ac.uk/wkc1/DIY/gch.operation/msg00046.html

which gives good an explanation - to eliminate this from possibilities.

 

[kevplumb]

could be the locksheilds too far open

 

[noodlz]

good ...or not open enough?

 

[kevplumb]

would be worth opening all trvs full then shutting down one at a time and wait for the clunk

is there a bypass or auto bypass fitted

me mam always said i should have been a plumber

 

[noodlz]

...or a comedian

 

[mandyp]

Don't know about the bypass thing, Allan is at work right now, will ask him when he gets in....and will get him to read the link...no way can he have fitted the TRV's the wrong way round (would never happen....he's a man

Prior to him reading this I just wondered, the clunking/banging noise doesn't actually come from the valve, the noise comes from nowhere near the actual radiators....could that still be the TRVs?

 

[kevplumb]

yes the noise travels down the pipework
if you have trvs on every rad and no bypass it could be your problem

 

[noodlz]

Does happen, even to a man

Could still be trv's...at one place had two engineers trying to figure out how this noise was occuring...moved about aswell...bit of mystery...only clue was if adjusted trv where pipe run noise was near stopped. After lots of searching found this out as possibility and then checked and 'three' of the eight trv's were on wrong way! Drain down and put back right way...no more probs!

Might not be this but easy to check.

Good luck!

 

[mandyp]

Thanks for all the help and tips, we'll investigate it over the weekend....hopefully I won't need to post again about this, but Allan doesn't think any of the TRVs are the wrong way round!!