Plumber tells me diverter valve needs changing? Weird humming from boiler when rads turned down

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CNorts3

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Hi all,

Been having a strange whining/humming noise coming from my boiler. (Combi boiler - Ferroli i25). When the system is on and all radiators are on full heat it works perfectly, however when one is turned down the boiler makes a fairly loud vibrating/whining/straining noise, and when that radiator is turned back on it's back to quiet again.

Had a plumber round that suggests it could be dirt in the system, and mentioned the diverter valve or "plate" could have dirt inside and that would be the fix - to replace the diverter valve, and clean out the "plate" whilst he's there to remove dirt from the system.


Does this sound correct, and if so what should i be expecting from price?

Thanks in advance
 
when you say "one is turned down " do you mean a specific one or any one of them ?
 
Any of them - as soon as one is turned down the noise happens
 
ISTR diverter valves are simply a rubber flap inside.
Taking them apart and cleaning them has worked for me in the past so may not need expensive replacing.
 
When you turn down a rad and it starts making the noise, completely close that rad , does the noise then stop ?
 
ianmcd said:
post pics of what Thermostatic rad valves you have
Click to expand...
danfoss_randall_ras-c2_push_fit_thermostatic_radiator_valve_013g606000_-_10.jpg
Hi - these ones are the ones we have
 
mattylad said:
ISTR diverter valves are simply a rubber flap inside.
Taking them apart and cleaning them has worked for me in the past so may not need expensive replacing.
Click to expand...
Interesting, thanks for coming back - so do you think this plumber is trying it on a little with the new part, or does it make sense to replace the unit?
 
mattylad said:
ISTR diverter valves are simply a rubber flap inside.
Taking them apart and cleaning them has worked for me in the past so may not need expensive replacing.
Click to expand...
Also would you suggest getting him to flush the system to get rid of the dirt inside?
 
Doubt it is the deverter valve, definately isnt the "plate" as you call it, let us know what happens when you get the noise then completely close the rad valve, got a good idea what is wrong , but this test will confirm, if it is what I think the good news is you can sort it yourself
 
ianmcd said:
Doubt it is the deverter valve, definately isnt the "plate" as you call it, let us know what happens when you get the noise then completely close the rad valve, got a good idea what is wrong , but this test will confirm, if it is what I think the good news is you can sort it yourself
Click to expand...
Will do tonight - unable to upload video direct but here is a link so you can hear the noise,

Onedrive link removed

Hard to explain what i'd describe the noise as?
 
Last edited by a moderator:
He probably meant the plate heat exchanger, which I think is the hot water one.
Apparently taking them out and cleaning them with spirit of salts works well.
 
CNorts3 said:
Will do tonight - unable to upload video direct but here is a link so you can hear the noise,

Onedrive link removed

Hard to explain what i'd describe the noise as?
Click to expand...
your link has been removed best way to upload video on here , upload it to youtube and post the link on here
 
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