combi boiler noise!

[allsorts]

Just moved into a new bungalow which is fitted with a Worcester 28cdi boiler, however when the central heating is on and the washing machine is in use the boiler makes strange noises, sounds as though the boiler is running dry there is a vibration sound which echoes around the whole bungalow, the pressure dial reads 1.0 bar. the only way to stop the noise is by turning on a hot tap?????????
Any thoughts as it keeps me up all night, every 1 1/2 hrs i have to get up to turn on tap???

 

[kevplumb]

is it ok if you run hot water ie fill a bath ?

 

[allsorts]

NO it is fine when running hot taps, when noise starts i turn on h/tap boiler fires and all noises disappear?

 

[kevplumb]

when you turn on the tap do you get a high pressure spurt first ?

 

[allsorts]

not that is obviously noticable

 

[kevplumb]

ok my first shot is just that (shot)
but my mind tells me its back pressure somewhere old brain cant hack it this late will have a sleep and a think
you might get a reply from some of the other guys when they wake up
advice is wach your post
sorry i cant be of more help at this time

 

[allsorts]

Have bled rads no air found, have increased the water pressure upto 1.2 bar, so far so good this evening, does this help??