I have a Nouva Simonelli Premier Maxi that I had to replace the volumetric pump in because it was plugged with hard water sediment. The new pump isn’t giving me a consistent pressure, it seems to surge and my pressure guage needle bounces over a range of

[techjoeb]

What is the recommended incoming pressure and is there any other regulators before the unit or is it just house pressure? Sometimes the surge and demand from other equipment causes inconsistent incoming pressure. It will drop to normal levels but then surge when there is no other demand. If the incoming pressure is spot on then it is probably the pump itself. Most cappuccino makers recommend a filter system to prevent hard water and better taste. That usually takes care of pressure issues. Please give us an update. Coffee machines are unicorns in this forum and it would be great to get some info on it. 

 

-Joe 

[fixbear]

have you purged all air?  Does the motor run smooth.  If these are ok, The pressure regulator valve may be hanging due to foreign material or scoring.