Worcester 240combi boiler - loud noise when hot water is run

[HenryKelly]

Our boiler has started making a very loud noise after a few minutes of the hot water being run. A sort of rattling loud noise. Often if I stop the tap and try again it stops but builds up again as the water continues to run.

Recently, when it has been on a long time we get the bang loud bang (i think its the grate on the outside of the house) almost sounds like its getting too hot and banging in to shape?) I'm not sure if this is connected or not?

Does anyone have any suggestions what I might be able to try looking at?

 

[HenryKelly]

could it potentially be it overheating - meaning perhaps the hot water pump in knackered?

How much roughly do new ones cost if so?

 

[Agile]

It sounds like a fan or gas issue which would need a registered engineer.

Tony

 

[HenryKelly]

It sounds like a fan or gas issue which would need a registered engineer.

Tony

I should add, the central heating is absolutely fine (apart from thwe odd bong here and there)

ooh ok i'd better give someone a call.