vaillant ecomax 835 howling noise

[shahed]

Need help & advice please.

our boiler ecomax 835 vaillant only 15 months old is making a rather loud hissing or howling noise. This has only recently started happening. It seems to occur when the hot water is turned on upstairs & downstairs.
The pressure is set at about 2 on the boiler gauge.

Any suggestions most welcomed.

The boiler is a condensing combi boiler. We have 10 double radiators of which 8 have TRV's and a hall way thermostat.

 

[andsam]

boiler under warranty call the installer.

 

[shahed]

boiler under warranty call the installer.

how long does the warranty last for?

 

[andsam]

2 years

 

[shahed]

2 years

thankyou. Indeed i shall give vaillant a call in the morning and live to tell the tale.