Fog horn from boiler

[chrisbell]

Hi,
We have a combo boiler and the last few weeks when running a bath the boiler has started to make an intermittent fog horn like revving sound. It doesn’t happen when the heating is on or when using sink taps. I went to the boiler when it happens and the flame icon disappears, it makes the noise for a few seconds and then seems like it fires up again. Any clues as to what’s happening?

Cheers

 

[cjg]

looks like it may need ajusting by engineer. temp running high?

 

[Darren Jackson]

May need gas valve & temps adjusting, If it has been over 12 months since last service then have it serviced by a GSR. But mention the noise prior to them coming out so they are aware of the noise it is making so they can service & investigate if necessary.

 

[garygvl]

if its under warranty ring viessman