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Nickso, I note in an old posting you even say yourself that the diverter is often at fault!
your low system pressure could well have been the only reason the boiler overheated and that small drip could well be the only leak, you often dont need vast quantities of water to escape to lose a chunk of pressure. im willing to bet now that you have opened the PRV its going to drip too though.
the diverter is able to be dismantled and the innards cleaned which is often the only thing wrong with them but its more often the small pipe that leads to the pump that is blocked and doesnt allow the pump flow to move the diverter to one position or another.
the best people to deal with these beasts really are worcester themselves, they have all the bits in the van and i dont believe the price will be vastly different. they will certainly know a lot more about it that joe plumber will and have far more chance of fixing it first time.
Yes but I didn't jump straight to the DV as the fault after the OP has made some concerns about the controls, as you did. (At least I hope I didn't)
Also, i suspect you may have misread the bold highlighted part anyway. When I said that was the only thing wrong with them I clearly meant that the diverter often only needs cleaning out, I did not mean that the diverter is the only thing that ever goes wrong with a Highflow. Anything can, and does, go wrong with a highflow.