Help Please: Servicing an HX Rocket espresso machine. How can I include a video ??

rogher

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Nov 21, 2020
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I think something's blocked in my Rocket espresso machine.
It screeches and dumps water when brewing, so shots are taking longer.
The screech is the same as I get when back-flushing.
De-scaling does not seem to help.
My machine is plumbed-in using filtered water.
No-one in the UK seems interested in servicing, so a home repair is required unless I use it as an excuse to upgrade (but even that is difficult in a lock-down).
So where should I start?
Any help most gratefully accepted.
 
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rogher

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Thanks.
I'll do my best - that's something I've not done before...
please be patient!
 
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rogher

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how do I attach a .mov file from my computer?
 
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rogher

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how's that?

With a blanking dish inserted in the portafilter for backflush, the group head pressure rises from around 9 bar to 13 bar (in case that's significant).
 
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Musicphan

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May 11, 2014
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Kansas City
I spoke to a friend who is the local espresso machine tech... feedback:

"That is a relief valve screaming, I would start by checking the pump pressure, it sounds like it is WAY too high blowing water out of the relief valve that is set to release at 12 bar. 9 bar is pump max. If not that, the relief valve needs to be tightened down".
 
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rogher

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I'd agree with that logic.
So how do I adjust the pump pressure?
There is an adjustment for the relief valve under the machine, but I'm not aware of any means to change pump pressure...
 
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rogher

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Group head pressure goes to 12.5 bar.
I've tried reducing the pump pressure by releasing the nut on the bottom of my Rocket machine by six turns, but there was no change.
 
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