Hello,
I have President 1Grp head that seems to be clogged.
The machine arrived very fast to 0.9Bar pressure in the boiler (around 20 minutes) but when I pull down the lever, there is very poor stream of water into the group head.

My water stream: For comparison, other President water stream (from other Home-Barista member): Someone has any idea how to fix it?

It looks like you posted the same video twice.

My guess is that your inlet valve is set almost closed.

That nut hanging down behind the group covers a valve which allows you to adjust the flow. The valve is very finicky, only a half turn between fully closed and fully open.

Here is a video I made to demonstrate how the valve works: As you can see the far group has the nut still in place, with the near group I have removed it to be able to adjust the valve.

I'll also state that if the cause of your flow is indeed simply that valve, then a slow inlet flow is not necessarily a bad thing. I set mine low on purpose as I feel it works better for light roasted coffee to have the chamber fill more slowly with water.

Opps, you're right. I tried to post your video as comparison.

OK, I will try it as soon as I'll be back at home. I hope you're right. I'll update you.

Thanks, again , for your very helpful inputs.

Yes I agree with Dominick, the flow valve may need to be opened a bit more. But the flow doesn't look too bad to me.

dominico wrote:It looks like you posted the same video twice.

My guess is that your inlet valve is set almost closed.

That nut hanging down behind the group covers a valve which allows you to adjust the flow. The valve is very finicky, only a half turn between fully closed and fully open.

Here is a video I made to demonstrate how the valve works: As you can see the far group has the nut still in place, with the near group I have removed it to be able to adjust the valve.

WOW, you rocks !
Works great. Now I know better my lovely President mechanism.
That adjustable pre-infusion is genius.