Hi Sam,
Assuming that there is no water leaking from the exhaust of the group, some possibilities which immediately come to mind are:
[*]Faulty OPV jammed open- scale?[*]Scaling in capillary tube leading to gauge- leading to an incorrect reading[*]Pump on the way out (though this would be pretty unlikely)
Id get a pressure gauge onto the the group first to verify that what you think youre seeing is actually occurring..
Failing this, its probably a job for a service bloke...
Good luck

2mcm

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