file Gaggia Classic woes when hot

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8 years 2 months ago #4569 by Solo
Gaggia Classic woes when hot was created by Solo
Hi all.

My Gaggia Classic is having an issue where, when the machine gets very hot, there is no flow at all through the group head. The pump is working, as I've got steady water flow through the steam wand at all times. And if the machine isn't too hot, i.e. if it's been on for only 10 minutes or so, I get what appears to be normal flow from the group head. If left on longer, it gets hotter and when I try to brew the pump is reduced to a hum and there is no flow at all from the group head.

I've descaled and backflushed the machine. I've also cleaned the shower screen and screen holder, as well as disassembled, cleaned and replaced the three way solenoid. I'm at wit's end. Any ideas?

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8 years 2 months ago #4570 by colin
Replied by colin on topic Gaggia Classic woes when hot
excellent question!

theory:

There is a "Steam cap" above the "brew block"
in the Gaggia (all of them in fact..)

It is a ball bearing or rubber bearing on
a spring that keeps steam from coming
out of the brew head when the machine is
in steam mode --
Normally, when the machine is in brew,
there is more than enough pressure to
push the spring and bearing out of the way
so water can get through.

Entirely possibly it is sticking when the
unit gets too hot.
That water moves freely out the steam wand
and the pump sounds normal are valuable clues.

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8 years 2 months ago #4571 by Solo
Replied by Solo on topic Gaggia Classic woes when hot
Thanks very much. Do you happen to have a picture or diagram showing where that part is?

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8 years 2 months ago - 8 years 2 months ago #4572 by colin
Replied by colin on topic Gaggia Classic woes when hot
yup.

here.

Number 27 on the diagram.
Last edit: 8 years 2 months ago by colin.

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8 years 1 month ago #4574 by Solo
Replied by Solo on topic Gaggia Classic woes when hot
Thanks. Does that mean it's contained in the solenoid? If so, how do I check if it's bad?

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8 years 1 month ago #4575 by colin
Replied by colin on topic Gaggia Classic woes when hot
Much simpler than that -- it is merely a spring and a rubber plug - nothing electrical here at all.

I think it is simply a matter of taking off the shower screen
and then removing the brew block (with two big allan head bolts)

It should all become obvious.

I know, that diagram is not very clear.

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