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Thanks Dave I have text to run the points past him & explained I had got this info from Alpha direct (so as not to dent his confidence) It is interesting that the pressure remains reasonable stable when the heating is off (just DHW on) and drops like a stone when the CH kicks in? I'll...

Thanks for the replies, Agile & gasmick2 I'm pretty sure he hasn't checked the expansion vessel & combustion chamber, so I'll run it by him tomorrow. He was suggesting we put a chemical through the boiler as it could be a blockage, but although I am not an engineer, my logic still cannot...

It must be an Alpha thing as I have a Alpha 240E doing the same thing with (well managed to sort the DHW out with a new diverter valve) pressure falling daily. No ideas yet as to why, no leaks visible anywhere

Hi having a bit of fun (not) in trying to find out why the pressure on my Alpha Ocean 240E boiler constantly falls (needs topping up when heating is on every 20 mins). It does not fall as much when it is set on DHW, but nevertheless still falls. I have checked all the pipes / carpets for...