Thanks! Will try and let you know!

I wonder if anyone can comment on the procedure shown in this youtube video. It seems the simplest but I would prefer approval first.

http://www.youtube.com/attribution_link ... video_user

I have a Rocket Giotto Evo. 2 for about a year and a half. I only make 2 drinks each morning (cappuchino and espresso). I have not ever descaled but I do a chemical backflush every 2 weeks. I do not notice any problems when I inspect the mushroom. The machine is used with the tank reservoir (not plumbed). Thank you for looking.

ok tried the thing with the air, didn't work. Thanks for the hint though.

@erics: does the mushroom procedure solve the thermosiphon stall?

. . . does the mushroom procedure solve the thermosyphon stall?

No. It is intended to primarily be an inspection procedure.

Problems with reduced temperature at the grouphead with Rocket machines is most often solved as I posted previously:

The upper thermosyphon tube from the heat exchanger to the grouphead is fitted with a 3.00 mm restriction orifice at the grouphead end. I suspect that this orifice is clogged with a bit of scale. You need to remove this tube and soak in a glass of white vinegar or descaling solution for an hour or so.

And then Roger from Illinois posted about a similar problem with his ECM machine. A good thread on this type of problem with ECM machines is here: HX tuning an ECM Technika

A similar problem but certainly not a similar solution.