Strange noises from boiler

[raok03]

Hi,

We were asked to check which Gas meter was ours British Gas and as well as the gas at the hob, we turned the Central Heating on/off a number of times in quick succession (3-5 times during a time of 6-10minutes).

Since then, when the CH starts, we get a loud bubbling/banging noise that seems to originate from the boiler and then through the rads. If I turn the HW on, the noise dies down.

Eventually as the system heats up the loud bubbling/banging noise dies down and then we just hear a noise that sounds like bubbling/water filling up coming from the boiler.

Bled the radiators but only a little bit of air came out from one of the rads.

The pressure when cold is above 1 and once the CH starts it hovers around 1.5. I've noticed that when the bubbling noise happens, the pressure needle wobbles around.

If it is trapped air inside the boiler, will it settle after a few days?

We have Worcester 24i RSF Combi. It was serviced just 2 weeks ago, and we haven't had any complaints with it until the other night.

Any help/advice is greatly appreciated.

Thanks,
KR

 

[Agile]

It does sound like trapped air but I dont know why based on what you have said.

Inside the boiler there should be an auto air vent. The cap on that may be closed completely or the valve may be blocked.

In any case it will probably settle down after a few days.

Tony

 

[dangas123]

It could be your heat exchanger is damaged. Does it sound like a kettle boiling at all? You may have a scaled heat exchanger

 

[stardanny]

We have Worcester 24i RSF Combi. It was serviced just 2 weeks ago
KR

If it keep doing that, Why don't you call them back?

Dan

 

[raok03]

thanks for all your replies, much appreciated

Tony - where can I check the auto vent? The documentation says that it should be located in the top left of the boiler. But after I take the front screen off all I see is a metal case with the window to check the burner.

Dangas- sounds more like water going through pipes(I guess its like boiling). But why would this start happening overnight? Its been fine until we did the turning on/off too much too quickly.

Dan-if it doesn't settle down I will call them back. Just wondering why it would start like it did.

KR

 

[skippy3]

I have a worcester 240 combi boiler must be more than 20 years old had the same strange noises. All I did was keep bleeding the system and recharging it and eventualy it faded away. Hope you get it sorted cause old boilers are ok when they're working not too many complications.
Skippy3