It keeps going "donk'" and it's driving me mad!

i have a heater that does that/they told me it was condensation/a random drip as system drys out
dont know if that helps
maybe theres a law and order episode playing somewhere doink doink{grin}
sorry was the first thing that came to mind.

mimiro nothing is leaking (as far as I'm aware )

It's just going donk!

Sounds as if one of the radiators has air in it.Get Mr P to look at them, not worth a plumber coming out if you can find the problem yourselves.

its not a leak more like a tiny drip as it evaporates.it goes away after about half a day the first time its on,but i live in an incredibally humid place
also agree with the air trapped idea.havent had radiators in awhile but remember all sorts of sound effects each winter as they were turned on.papa always fiddling with the key and tapping(dont know if it did anygood)until he was happy with it all.

Nothing really helpful to suggest but I am reminded of when my car had an annoying rattle so I took it to our lovely local garage in the village.
After much sucking of teeth and shaking of heads, I was asked if the car had a radio?
Yes, I thought, sensing a cause of the problem....
"Well, I'd turn it up a bit if I were you then you won't hear it!"

Maw

Never mind a radiator key. You obviously need a 'Donk-key'

Missadventure

I'm reminded of the Val Doonican and his magnificent toy

I also think you may have some trapped air Phoenix

Or what Terry Wogan might have referred to as "trapped wind"??

If Mr.P is still working away from home, you can meet him at the front door tomorrow evening with the radiator key in your hand. Then I know that he will feel wanted. It does sound like air in one of the radiators. Are you sure that it is not coming from the boiler itself?

phoenix I agree you need burping

I think Mr P should have another go at bleeding the radiators. We had a similar problem but ours was a clunk not a donk but we had hissing too ?

Well I never did! Trapped air! Trapped wind!

This is my heating system we are talking about, not my digestive system!

Of course as a "lady" I do not have any form of wind (trapped or otherwise) and have never ever had either botty burps or windy pops,the elder of which my boss's dogs seems to be a martyr too.

I suggest you flush the system through with gripe water.
Sorry?

Some very witty answers on here today have made me smile thank you??

When we first had our central heating put in, yonks(donks) ago, our lovely old fashioned plumber told me not to bleed the radiators when the pump was on as "some radiators suck and some blow" . Don't know how true this is/was, or even if relevant for new systems.

Maybe it's a centipede with a wooden leg.... you know the one..99 donk, 99 donk

I believe your supposed to bleed radiators with the heating switched off. That way no air is getting pumped round so no donking!

Chris, you are right about the pump being off.

We leave the system on all the year aglow, with one rad on just to keep things moving around, never needed to bleed.

Could it be the pipes expanding as they get hot?