My boiler is 7 years old (a HENRAD 50FF) and seems to have developed a very annoying buzz when it is on. The buzz seems to be to be close to the 50Hz buzz which sometimes come with electronic equipment. Any suggestions as to how I might reduce this?
Thanks to htg engineer for his response. I have checked out the boiler and it does seem as if the noise is coming from the solenoid valve. When I restrain the coil the noise is reduced. Is there a permanent fix for this problem?