it started about 3 years ago the vokera combi boiler is 10 years old and has been insured by vokera since day 1 anyways 3 years ago it started making a noise like a motor working like a purring tone rather annoying you can hear it upstairs the first year i didn't do anything about it it would go on all day and all night just randomly for hours at a time so last year i had enough and rang vokera since the first visit by vokera the has been another 6 visits each time replacing a part from valves ,pumps switches to diaphragms and it goes on still making that annoying noise i have since the last few months discovered how to stop the noise by running the hot tap for about 3 minutes witch i discovered by accident and its only temporary this can go on up to half a dozen times a day so do i keep pursuing it or get someone else to look at it any thoughts cheers will...