Radiator advice

[daveyrach]

Recently moved into out new house and my uncle came and services the boiler, flushed the system and added inhibitor. Now there is one Rad in my bedroom which constantly need bleeding I have had to do it both morning this week so far, I know when it needs doing because the Rad is noisy when it comes on in the morning.

The system is 5 years old and there is a 32kW Combi Boiler, I have this morning repressurised the system after bleeding as it was low so have done it up to 2 bar.

I have checked all the rad for leaks and all down stairs pipework is exposed as we a solid wood parquet floor and there are no damp patches on downstairs ceilings to suggest a leak in the upstairs pipework.

Maybe he didn't refill and bleed sufficiently, could anything else cause this problem other than leak and air from flush in the system?

[Specialone]

Is that the highest rad in the house?

Is your pressure constantly losing pressure?

If so, you have a leak, have you noticed any water by the actual boiler? Boilers have an auto air vent above the pump, I have seen tons of these leak so the next person who services it closes it off so you cam never get the air out.

[daveyrach]

No pressure in the boiler is constant never loses any i think it is air working its way round the system, the rad in question is on the second floor with 4 others but it is only this one and occasionally the bathroom rad which need doing.

[daveyrach]

So update, I bled all the rad in the house and re-pressurised the boiler back up to 2bar as in the manual and re-bled again. Rechecked the pressure in the boiler all OK.

So Monday, Tuesday there was air in the Rad upstairs, Tuesday evening I did the above and i checked all the Rads on Wedensday, Thursday and this morning and there was no air in any of them but the pipes are still noisy but only in my friggin bedroom, what else could cause noisy pipes??

[Geodude]

You probably already have but i would give your uncle a shout back.

[Sir Trev]

How did he do the "flush"? Was it just a quick job with a hose or was it a proper pressure jobbie taking several hours reversing the water flow a few times? The former can leave debris in odd places.

If it makes you feel any better I have to bleed my system at least once a week but it's not pressurised and is caused by the moron builder that installed it putting the vent to the expansion tank in the wrong place (will be moved later this year).

[daveyrach]

I have told him he is gonna come look, but it was a quick job with a hose on his way back from work, was free so can;t grumble as he did service the boiler and do a Gas Safety Certificate all for nowt.

[Specialone]

Couple of questions...

Is the pump noisy in the boiler? No whining or rough running?

It could be your rads aren't balanced, but to help get all the air out, turn the valves off to every rad in the house bar the problem one, get somebody to monitor pressure on the boiler, show them how to fill up when required.

Then, bleed the offending rad, but let a load of water run through bleed screw, fill a jug at least, you may see some spluttering after a bit.

Make sure pressure is good then open the other rads back up and see how it goes.

[daveyrach]

No boiler and pump are fine not at all noisy. I will give that a go see how it goes

[Bluefish]

2 bar is too high, i put to about 1.2 bar 1.5 at the most, as the pressure rises when the boiler gets hot and if it gets to 3 then water will go out the prv, and you dont want that happening.

[punyXpress]

The noise isn't pipe expansion is it?

[daveyrach]

2 bar is too high, i put to about 1.2 bar 1.5 at the most, as the pressure rises when the boiler gets hot and if it gets to 3 then water will go out the prv, and you dont want that happening.

The boiler was warm at the time as the heating had only just gone off also 2bar is bang in the middle of the green area on my pressure gauge. Changes to a red area at 3.5bar

[daveyrach]

The noise isn't bloody annoying when you are sleeping isn't it?

Corrected for you :)

I thought of pipe expansion but was told it was unlikely

[Winder]

We had very noisy rads in the bedroom and bathroom when we moved in. Bled rads and still noisey. Lifted the floor boards and clipped and secured all the pipes every few feet. No noise now.
Think 2 bar is a bit high as mentioned before

[daveyrach]

So 2bar is too high even when the boiler is hot and is is well within the green on the pressure gauge.

[Winder]

Mine is marked 0-4 bar. 0-1 red, 1-3 green, 3-4 red.
The bloke that done the service said it should be between 1 and 1.5.
I don't know why I'm afraid, each boiler may be different or it may depend on how manta rads you have and how far they are from the boiler. Sorry, not much help