Apologies for starting a new threat on an existing issue, but things just seem to be getting weirder re/ fluctuating brew pressure during shots. As per my previous posting, I mentioned that Brewtus was making my kitchen lights flicker slightly, and that this stopped when the boiler kicked in. I also stated that when running, the pump would oscillate slightly when the boiler light was off, but would stop oscillating when the boiler light was on. So, here's where things get weird - with looser grinds and lighter tamping, the pressure behaves normally when pulling a shot. When I tighten the grind and tamp harder, the pressure behaves erratically towards the end of the shot, oscillating between 7 and 8 bar. This machine is only a month old, so I'm pretty sure the OPV and pump are o.k. I'm wondering if this issue is linked to the lights flickering issue - in other words, the pressure fluctuates as the pump fluctuates slightly when the boiler is off. Tighter grinds and harder tamping exacerbate the issue because they increase pressure in the portafilter. I should also mention that the oscillation seems to not happen if the boiler light is on. Looking for potential solutions - backing off the brew pressure seems to have helped some people with a similar issue to mine (currently set around 12 bar at the factory). Also, was thinking of beginning my shot when the red boiler light is on by running the steam wand before a shot......ANY help/suggestions would be appreciated.
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