Hi everyone. I'm a long time lurker, first timer poster.
In our house we have a Linea 726 combi boiler. Its 6 years old. Over the last year it has become noisy and I've had an engineer service it in the last couple of months.
Initially having read various things about kettling I had assumed this was the noise I was hearing. The heating engineer who looked at it (who was doing this as a homer and by day is a Scottish Power heating engineer) thought that it sounded like the boiler was kettling. He did the service and said he'd get back to me.
After that the guy didnt seem very interested. Seemed very busy in his day job and eventually sent me a text to say that he had contacted the manufacturer who said the system needed a power flush.
Due to how busy the guy is and his level of interest I think the guy has made a phone call and said "the boiler is kettling" and has had the obligatory "powerflush required" answer.
Moving on, I decided instead of shelling out for that I would treat it with Fernox DS40 first. Left it in for a week and followed all the steps. Hasn't made any difference. In fact, if anything, it seems noisier than before.
When draining some water out of a rad I notice that it is foamy. Should also mentioned that the system has been bled and balanced, but that I can bleed a bit of air out of some of the rads every day. The boiler pressure isn't dropping but in fact, climbs as the system is used (which I believe is normal?)
That's the history, now to move on to the pump. I decided to investigate further tonight. With the cover on the noise is hard to pin point. I took this off and cranked the room thermostat up in order to force the boiler to fire up. The pump sits in front of the DHW heat exchanger (is this where kettling occurs?) and so at first I though the noise was coming from it and therefore a powerflush would still be required but now I'm wondering if its actually the pump that's worn out.
Whilst the boiler is making the noise, I killed the boiler by switching it off at the mains and the sound instantly stopped. If it were kettling, surely the sound would continue for a short spell as the water continues to boil in the heat exchanger rather than instantly stop when the power is switched off? Did this test a couple of times with the same result.
I should also mention that hot water from the tap seems to be taking longer to heat up but there are no sounds from the boiler when the tap is being run. This issue is purely related to the central heating system.
All rads in the house are hot, with no identifiable cold spots. So my question is does it sound like my pump is knackered and what does a dying pump actually sound like?
Thanks for wading through this and any help or insight that any one can provide will be gratefully appreciated.
Thanks guys,
Derek.
In our house we have a Linea 726 combi boiler. Its 6 years old. Over the last year it has become noisy and I've had an engineer service it in the last couple of months.
Initially having read various things about kettling I had assumed this was the noise I was hearing. The heating engineer who looked at it (who was doing this as a homer and by day is a Scottish Power heating engineer) thought that it sounded like the boiler was kettling. He did the service and said he'd get back to me.
After that the guy didnt seem very interested. Seemed very busy in his day job and eventually sent me a text to say that he had contacted the manufacturer who said the system needed a power flush.
Due to how busy the guy is and his level of interest I think the guy has made a phone call and said "the boiler is kettling" and has had the obligatory "powerflush required" answer.
Moving on, I decided instead of shelling out for that I would treat it with Fernox DS40 first. Left it in for a week and followed all the steps. Hasn't made any difference. In fact, if anything, it seems noisier than before.
When draining some water out of a rad I notice that it is foamy. Should also mentioned that the system has been bled and balanced, but that I can bleed a bit of air out of some of the rads every day. The boiler pressure isn't dropping but in fact, climbs as the system is used (which I believe is normal?)
That's the history, now to move on to the pump. I decided to investigate further tonight. With the cover on the noise is hard to pin point. I took this off and cranked the room thermostat up in order to force the boiler to fire up. The pump sits in front of the DHW heat exchanger (is this where kettling occurs?) and so at first I though the noise was coming from it and therefore a powerflush would still be required but now I'm wondering if its actually the pump that's worn out.
Whilst the boiler is making the noise, I killed the boiler by switching it off at the mains and the sound instantly stopped. If it were kettling, surely the sound would continue for a short spell as the water continues to boil in the heat exchanger rather than instantly stop when the power is switched off? Did this test a couple of times with the same result.
I should also mention that hot water from the tap seems to be taking longer to heat up but there are no sounds from the boiler when the tap is being run. This issue is purely related to the central heating system.
All rads in the house are hot, with no identifiable cold spots. So my question is does it sound like my pump is knackered and what does a dying pump actually sound like?
Thanks for wading through this and any help or insight that any one can provide will be gratefully appreciated.
Thanks guys,
Derek.
) put the blade on the pump and use it as a stethoscope to see if that localises the sound?
