I have a MegaCrem 1 group which is 7 years old. It works fine except the g/head pressuer is 5 bar. Changing the pump pressure nut makes no difference, closing the overpressure value makes no difference. (I have now lost the original setting for the opv!!). If I disconnect the inlet from the mains supply and stick it in a jug, it wont suck water even though the pump motor makes a noise. So I cannot descale to remove any blockages.
Any suggestions??
Thanks.
Any suggestions??
Thanks.

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