Thermostatic Radiator valve hissing

[Shanz]

Hi All,

I have just had complete central heating system fitted with a baxi duotec 33, 6 radiators each with a Bulldog thermostatic radiator valve fitted.

The radiator in my bedroom makes a hissing sound if I turn the valve up above 3 and it's stopping me from sleeping. :angry_smile:
Note that I have bled the radiator so that all air is expelled and all other radiators are quiet.

Can anyone advise on how to stop this noise - it's doing my nutt in.

Cheers,

Shanz

 

[SimonJohns]

Try opening the lockshield a bit more


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[Shanz]

Simon - sorry to be a numpty but where is the lockshield?

Cheers

 

[SimonJohns]

Is the other side of the rad. TRV one end lockshield the other.

You may need to take the cap off top turn the valve open.

Please leave feed back if it works


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[Kimou]

Hi All,


The radiator in my bedroom makes a hissing sound if I turn the valve up above 3 and it's stopping me from sleeping. :angry_smile:

Reminds me of the one about aguy who went to the doctors and said " it hurts if I touch here" And the doc says "don't touch there then!"

No, really though, call back the guys. If they've just done a big job for you then they may just replace it anew. Let's hope they don't have another hissy-fit.

 

[AWheating]

turn your heating off its summer!!

im with simon, open the lockshield valve slightly (make the noise happen,remove white cap, turn with pliers anti clockwise, does noise stop?). If that does not help then call the engineers back to check the trv.

 

[WaterTight]

what on earth would make a hissing sound on a trv valve that's turned up past 3?

 

[diamondgas]

Only 6 rads .... Hissing ....... If the above doesn't work your system could benefit from having an automatic bi-pass fitted. reduce the flow through the system as the rads shut down can stop the hissing. IMHO

 

[SimonG]

Normally I would say water velocity, and then I thought about it only when turned up from no. 3, then I thought it's summer (supposedly) it's maybe only opening at 3, then I thought velocity again. Get em back and fit a auto bypass as diamondgas has said. Not too familiar with gas boilers but if its owt like the oil than yhe mi's will probably ask for one, if there isn't one built in.

 

[AWheating]

auto bypass valve is a standard fit, if there is not one fitted i would ask your engineer why?

 

[Shanz]

SimonJohns - Thankyou very much for your advice - it worked.
I opened the lock shield completely and no hiss.

The strange thing is it seems like the lock shield was about 98% shut in the first place!!!
When I asked my installer (who apparently has good reputation) about the hiss a few weeks back he told me he took a look at it and couldn't work out why it was happening - he thought it might be a faulty TRV. Surely he should have known to look at the lock shield first.

Anyway thank you to you and to everyone else who helped out on this. I can now sleep.

 

[SimonJohns]

You didn't need to open it all the way lol. If you fond some rads stop workin, shut the valve down slightly. It will help improve flow around your system


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[AWheating]

He had either shut it down to balance the heating system when commissioning or he did not even check it? (which would worry me)

 

[WaterTight]

well we all miss stuff don't we

also could have been the apprentice.

 

[AWheating]

its always the apprentices fault! even on his/her day off

 

[kay-jay]

When I asked my installer (who apparently has good reputation) about the hiss a few weeks back he told me he took a look at it and couldn't work out why it was happening - he thought it might be a faulty TRV.

what i find most alarming about this is not the fact that he was ignorant of opening the lockshield, but rather that he was aware of the issue, assumed a faulty valve, and just left it in situ, got paid and buggered off without mentioning it!!

KJ

 

[tackleburger]

auto bypass valve is a standard fit, if there is not one fitted i would ask your engineer why?

If it's built in you don't need one

 

[SimonJohns]

If it's built in you don't need one

Totally disagree. Yes the is less of a need for one to protect the pump and boiler

Bit in this instance I think it may have just been a case of poor balancing. And as the other TRVs start to shut down the problem may come back due to high flow rates.




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[AWheating]

If it's built in you don't need one

most design enginners include an auto bypass valve whether or not the boiler has a built in bypass. Every council, housing bum, builder i have worked for for the last 4-5 years fit them as standard. For the small cost i would always fit one.

 

[GrahamM]

most design enginners include an auto bypass valve whether or not the boiler has a built in bypass. Every council, housing bum, builder i have worked for for the last 4-5 years fit them as standard. For the small cost i would always fit one.

I agree. It's good practice to fit one wither boiler contains one or not.