Boiler noises

[mark]

Combination boiler is making horrible scary noises when I run the hot tap.

How can I put this right?

mark

[Tim S]

mark coughed up some electrons that declared:

What sort of noises? Screeches, bangs, buzzing?

Tim

[YAPH]

Is it OK if you run the central heating?

What's the system pressure (on the pressure gauge)?

Does it make the smae noises at all flow rates?

What make & model is the boiler?

[Jules]

Earplugs?

[mark]

Biasi, M90F 28S about 5 years old. No probs with central heating riunning alone.

0.5 bar Water temp on the boiler dial gets to about 70deg.

Noises are loud, screeching, gurgling, banging. Happens at medium flow rates or if washing machine is on.

mark

[Frank Erskine]

On Tue, 12 May 2009 07:49:52 -0500, Jules had this to say:

Angle grinder. It'll mask the noises.

[YAPH]

ah, there's yer problem guv ;-)

, M90F 28S about 5 years old.

What happens if you put the system pressure back up to 1 bar?

Does it have a water temperature control? How's the problem if you turn this down?

It sounds as if possibly the water is boiling in the primary heat exchander. Does this model heat the DHW directly in the primary heat exchanger, or indirectly via a plate heat exchanger? Are you in a hard water area? Is the scale inhibitor correctly topped up with snake oil? :-)

[geoff]

In message , mark writes

Earplugs ....

Or some basic, useful information

[RobertL]

0.5 Bar? ? should it not be closer to 1.5 Bar?

RObert

[Doctor Drivel]

Fitted properly in a clean system, they are no problem.

Sound lime the plate heat exchanger is blocked. Best replace.

[mark]

I increased the pressure to 1bar and has crept up to 1.5 bar. Since then I have been unable to recreate the noise. So hopefully 'tis cured. Thank you.

mark

[mr fuxit]

Don't run the hot tap!

[grantly]

Maybe some sediment got moved along the pipework somewhere.