Can't Pull the Shot

[Firochromis]

Hi,

I have a problem on my S1V1 but a little background first:

I bought this machine second hand from the La Spaziale service in Turkey. By saying 'service', expecting something like Chris Coffee Service would be naive but nevertheless I trust them as this machine is in good shape. The problem is, I'm new in this class of machines so I can't justify if I'm doing something wrong or it's the machine.

Ok, my problem is I can't pull the shot fully. It starts normally but after a few seconds, with 5-10ml of coffee inside the glass, the operation stops. Some water comes from 3-way valve. My machine don't have a pressure gauge on the brew boiler so I don't know neither the pumps pressure nor the expansion valve setting.

I tried a backflushing (first time in my life) but it didn't work either. I expected to see 60ml water coming from the 3-way valve (when backflushing with 2 cup button and blind disk is full of water), but no. It seemed like pump can not finish that either.

So can you help me with this.

Regards

[chas]

It sounds like you need to reprogram the volumetric dosing.

[Firochromis]

Chas, when no p/f attached I programmed the volumetric dosing as: Single shot: 30ml; double shot as 60ml. When it can't finish the shot, I de-attached the p'f and checked those values, and they are correct.

[chas]

You have to program the amount of coffee you want in the cup with coffee in the PF. The grounds absorb a lot off water.

[Firochromis]

Oh wait!! How does volumetric dosing programming is done? I dosed no portafilter attached, I guess I have to attach portafilter loaded with grounds and measure the water inside the cup?

[goodboyr]

Yes. You program while doing an actual shot. Measure the shot glass level with water so you know where the level is corresponding to the volume you want. Then actually prepare a shot and set the volumetric programming while doing the shot.