water flow noises in central heating

[huwy123]

hi there,

For some reason my central heating has got a lot noisier recently - you can hear water rushing around the system. Sounds like its circulating at 100mph!

I've a worcester 42 cdi combi. Pressure is about 1.5 bar when boiler is off going up to 2 when its on.

I can see from a service manual that the "pump step" can be altered but don't want to mess around with the system!

I'd be grateful for any ideas on troubleshooting this.

-Huw

 

[Agile]

Water to all intents flows silently.

It sounds as if you are hearing the effects of gas/air in your system.

That should be able to be removed with the radiator air bleed screws.

See the FAQ on this site.

Tony

 

[DH6]

Faulty thermostatic radiator valves

 

[Agile]

I would not call noise from a TRV "water rushing" but more of a hissing sound.

But turning the TRV head would alter the noise sound.

But he seems to be speaking about all the rads/system rather than just one or two rads.

Could in theory be a misadjusted or failed auto bypass.

Tony