Could this be faulty divertor valve?

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During the last year since we moved into our house there have been random days where we found the boiler pressure at zero. We would refill and all would be ok for anything between 1 day to two months. The boiler is a Rhino oil fired combo about 4 years old. More recently it's started doing it more often.... every few days or so. But when I re-pressurise, it only takes a small amount to bring it back to 1bar, then as it reaches temperature it's actually over pressure and it vents out. What I did notice the other day was that when operating normally, the pressure is around 1.5 to 2 bar during heating only, but when hot water is demanded it drops to barely readable, but then recovers back when hot water is turned off. Could this be a faulty diverter valve that instead of diverting water to the hot water supply, it allows it through 'as well' - instead of 'instead'?

As an aside, up until recently, the boiler was wired with one pair of wires from the controller, meaning we only got hot water with the full central heating on. Strange. That issue was fixed by getting the plumber to wire it as it should have been.

Any thoughts?

Thanks.
 
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Expansion Vessel is the most likley issue. Dont know a thing about oil boilers so cant help you with spesifics. But a search of google and the forum for central heating expansion vessel fault will spring many problems the same as yours
 
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