LObin wrote:I will definitely measure temp in the cup tonight. I did read about TS stall and always flush after a shot. I also tried a half a second flush prior to locking in the PF.
I have left my machine on for anywhere between 16 and 48hrs. Never less...
I do however hear a little water sound that seems to be coming from the TS. Not sure if it should be silent or not. I bleed the air of the TS twice but it's still there. Thought it might be the water cycling in the TS that I'm hearing...
Maybe someone with an L1 can comment on this?
There should be no sound; if you have that "water bubbling sound' then you got some air in the TS. You shouldn't have this happening if you start from cold, and flush a little (almost immediately) after each shot. Easiest way (imo, ymmv) to get rid of it is to switch the machine off; let pressure go to zero (steam tap) and fire it up again. Long flushing should also help, but I 've got mixed results with that.
By the way, one hour is more than enough to get a stable group temperature, so 16-48 hours won't help much.
About your problem: temperature too low, might be it. Easy to find out: crank up the pressurestat to say 1.4 bar. The temperature of the group will go up, (even if the TS is partially blocked).
Hmmmm, just a thought: are you sure that there is no restrictor in the TS in your machine?? Reiss used to sell them to make the TS less effective, meaning to make the group temperature lower....
And last remark, is the portafilter heating up with the group? Or are you using it 'cold' ? ( in my experience this has effect on the taste of the espresso (lower group temperature of course) however usually not to that extent that it becomes undrinkable).
On the Londinium website under support you can find a description of a user modification how to plumb in with the HX being cold fed: meaning you could pre infuse at a higher pressure than the boiler pressure.