Loud high pitched noise combi boiler

[AnnaD2002]

Our newish (about 7 months old) Main Eco Combi Boiler has started making a loud high pitched 'wail' about 10 minutes after the heating comes on. It then comes and goes throughout the the time the heating is on. We live in a 4 bed house, most rooms had radiators installed at the time we got the boiler. It stops when we turn the hot tap on for a few seconds in the kitchen. Pressure is at normal level. Any idea what it could be? Also makes loud clunking noises every so often but this may not be related.

 

[dcawkwell]

Initially I would have said the fan.
But I'm perplexed as to why turning on the kitchen tap would stop it.
Does it wail if you run a bath for the hot water?

 

[AnnaD2002]

It stops when we run any tap on hot for a few seconds!

 

[ianmcd]

It is the diverter valve that is faulty, you can buy a service kit to repair it or buy a complete valve , better to get a RGI to install the service kit in my opinion but nothing to stop you from doing it yourself if you feel confident enough, I would also add that if that if it is only 7 months old it is still under warranty but they may refuse to carry this out if your system has not been clensed as this is the most likely cause on a 7 month old boiler

 

[Madrab]

Was the system cleaned when the boiler was installed, if so and it's only 7 months old then it should still be under warranty as Ian suggested, I'd get in touch with the manufacturer.

 

[AnnaD2002]

Thanks. I will get in touch with the manufacturer then. I would be amazed if the system wasn't cleansed at the time of installation. We have one of those fliter gizmos attached to the bottom of the unit - would that make a difference?

 

[Madrab]

You would know if it was flushed prior to the new boiler going in. Big water container with a pump on the top of it with a chap running it for most of the day.