This may seem like be a stupid question, but I only just came across the concept of priming the boiler using the steam wand.
I've been trying desperately to troubleshoot my shots, which range from sour to grapefruit-juice with the occasional delicious smooth nutty example. With fresh, well-roasted coffee (5 Senses TwentyFourSeven), an OPV set to 135psi and a Baratza Preciso dialed in for 25g pulls in 30 seconds, I'm still getting shots that are merely "drinkable" as caps/lattes.
I've also found that after the first shot, unless I use the steam switch to manually boost temp (which results in the next shot starting at ~98°C at the shower-screen if I leave it long enough and 92-89°C if I don't, quickly falling) I have to wait 15+ minutes until the grouphead returns to temp, and it still falls faster than I'd expect and produces a sour shot.
Now I read that it's necessary to prime the boiler and I feel a bit silly thinking that the sour shots result from pulling a shot from a half-full boiler that's quickly flooded with cold water...
So do I prime through the steam wand after every shot/PF-purge cycle, then get it to temp and repeat, or do I pull the shot, purge the PF, get it back to temp, THEN prime it?
I've been trying desperately to troubleshoot my shots, which range from sour to grapefruit-juice with the occasional delicious smooth nutty example. With fresh, well-roasted coffee (5 Senses TwentyFourSeven), an OPV set to 135psi and a Baratza Preciso dialed in for 25g pulls in 30 seconds, I'm still getting shots that are merely "drinkable" as caps/lattes.
I've also found that after the first shot, unless I use the steam switch to manually boost temp (which results in the next shot starting at ~98°C at the shower-screen if I leave it long enough and 92-89°C if I don't, quickly falling) I have to wait 15+ minutes until the grouphead returns to temp, and it still falls faster than I'd expect and produces a sour shot.
Now I read that it's necessary to prime the boiler and I feel a bit silly thinking that the sour shots result from pulling a shot from a half-full boiler that's quickly flooded with cold water...
So do I prime through the steam wand after every shot/PF-purge cycle, then get it to temp and repeat, or do I pull the shot, purge the PF, get it back to temp, THEN prime it?

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