Recent content by bilco

Hi Tony, Thanks for your further clarification re working harder in DHW mode does seem a likely explanation of what is happening and has brought up a consideration which I hadn't thought of. Will let you know how things work out but, unfortunately, will be away for about 10 days so can't get...

Hi, Thanks for suggestions all of which could be helpful but don't seem to quite fit what is happening. To improve my original info - the noise is rather like a loud bluebottle fly and is a continuous tone ( when it does occur which is not always). However, it only occurs when the CH is...

Vaillant VCW242E has recently started making a humming noise when running, sometimes it does, sometimes it doesn't. Suspected either circulating pump or divertor valve but very difficult to localize even by using a rod or similar against them to help conduct sound to ear. Is performing fine in...