After reading that, I think even more that your OPV is sticking at around 7 bar. When it closes for a moment, you go up to 10, it opens and sticks again, drops to 7, wash/rinse/repeat.
Did you take out the OPV screw and have a look and flip the puck? b On Mar 11, 2011, at 3:26 PM, jpaul wrote: > I thought I just responded to ya'll but maybe it didn't take. > > Good ideas, all. > > Here's what I know so far. > > The previous owner described exactly the same behavior before I bought > the machine. Extraction goes to around 7 bars for 8 to 10 seconds, > the leaps to 10 bars for a few seconds and then drops back down to 7. > > We are using different beans, grind and tamp and yet the behavior is > exactly what he described. > > My blind PF tests had the pressure go to around 9 and then continue > onto 11 but I think this may have been because I hadn't flushed the > head before do the first round with the blind PF. Each subsequent > test with the blind PF had the pressure at 9.5 to 10 bars with no > fluctuation. > > Further complicating the issue is that the pump has just been replaced > with the same model as OEM, from WWL. So, I would expect it to work > properly but who knows. > > Thanks all for helping me think through this! > > JPaul > > -- > You received this message because you are subscribed to the Google Groups > "Brewtus" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/brewtus?hl=en. > -- You received this message because you are subscribed to the Google Groups "Brewtus" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/brewtus?hl=en.
