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My Glow warm Space saver MK II boiler -buzzing sound?

My Glow warm Space saver MK II boiler makes buzzing sound when the heating or the hot water is switched on. Can you pls advice what could be causing it, & how much will it cost to mend it.
Keenlearner, March 2008
Thanks

keenlearner, March 2008
This sounds like it is just a noisy solenoid they can last for years like this without giving any more problems. if the noise is not bothering you then I would most likely just leave it

gary.wright53@googlemail.com, March 2008
thanks Gary,

boiler is working,
buzzing sound is coming from the small brown coloured unit at the bottom of the boiler

keenlearner, March 2008
you did not say if the boiler was still working or not?
but the most likely cause would be the fan if it is not working or the gas valve if it is.

gary.wright53@googlemail.com, March 2008