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Rocket Giotto Evo R - potential issue

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  • ev
    commented on 's reply
    I received the silicone o-rings from RS a few days back. The original o-ring in the 5 month old anti-vac valve was already going hard. The new one worked a treat!

  • ev
    commented on 's reply
    Agreed but you can't always avoid those things leaking/hissing. As I mentioned, my brand new anti-vac valve was hissing right after I replaced it. Occasionally, I just give it a flick, in hope that it reseats itself (or blows out any foreign matter). You really can't blame a service company for this.

    Evan.

  • Caffeinator
    replied
    Originally posted by noidle22 View Post
    That is the concern. This scenario played out a week or so back on another thread where a service company did a very poor job....
    I think it's often a playoff between "How little can I spend?" and "How thorough a job would you like to pay for?"

    Too often the owner is primarily interested in the former and some service operations are happy to generate some income by doing pretty much nothing.

    When I service my own machine, I have always been more inclined to replace anti-vac valves rather than just do the o-ring.

    Leave a comment:


  • noidle22
    commented on 's reply
    Interesting, i swapped from using those silicone o-rings to viton as there were reliability issues with the silicon. The silicon o-rings are also used in steam boilers on Breville machines and they fail badly within 2-3 years. The anti vac valves in the Breville's never leak though and it uses a viton o-ring in it.

    The viton ones easily last between services in the machines i do. I did read a bit just now that viton is weak to steam and hot water which I didn't know. Doesn't seem to have had an effect that I've noticed so far.

  • ev
    commented on 's reply
    noidle22, thanks for the details on the replacement o-ring. Before ordering, I did some searching & found this interesting post. This person tested viton rubber against silicone o-rings. Viton only lasted 60 days!

    http://www.espresso-restorations.com...mbreakers.html

    I ended up ordering these silicone o-rings:

    https://au.rs-online.com/web/p/seals-o-rings/5279756/


    Evan.

  • ev
    replied
    I wouldn't question the quality of service over a leaky anti-vac valve. They always leak! I fitted a brand new one a couple of months back (larger brass type) and it's leaking right now.

    Evan.

    Leave a comment:


  • noidle22
    replied
    Originally posted by brewy View Post
    Would be happy for a simple fix
    It is a simple fix fortunately. You can replace the o-ring with a new one which can be bought online. They come in packs of 50 but it's only $14 or so. You can get them from RS Components, the part number is 128-990. You may be able to source just one locally if you have an o-ring shop, just make sure it's a BS007 size and viton, not rubber.

    but at the same time concerned what other shortcuts may have been taken ?
    That is the concern. This scenario played out a week or so back on another thread where a service company did a very poor job.

    Take a good look inside when you change the anti-vac o-ring for any evidence of leaks. You could shine a light down into the boiler when you have the anti-vac out to see how good the descaling was.

    Leave a comment:


  • brewy
    replied
    Thanks all. Took the top of the machine this morning and gave the anti-vac a flick and as suggested this recreated the noise. So once the machine has cooled, will take the valve apart and hopefully dislodge any remaining scale. Would be happy for a simple fix but at the same time concerned what other shortcuts may have been taken ?

    Leave a comment:


  • noidle22
    replied
    I assumed that a service company would have repaired or replaced the anti-vac and this would likely not be the problem. I've been proven wrong with these assumptions of competence a few times before though now, maybe I should learn.....

    Leave a comment:


  • Caffeinator
    replied
    I agree. Anti-vac valve is most likely.

    Sometime after a descale (if it was required), stuff can move around and it's possible that some has lodged in the o-ring if it was replaced as part of the service.

    Might be worth pulling the valve down and checking or alternately, $20-30 covers the cost of most variants and it's a spanner job. May be worth just replacing it.

    Leave a comment:


  • ev
    replied
    It might just be a leaky anti-vac valve. Try flicking the pin that sticks out the top to see if the sound is coming from there. Very easy to remove to clean or replace. Worth giving it a clean first.

    Evan

    Click image for larger version

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    Leave a comment:


  • brewy
    replied
    Thanks for your help noidle, will take it back ASAP.

    Leave a comment:


  • noidle22
    replied
    I just did a slightly older Giotto Evo which also had a bad scale problem. It had a leak very similar to what this one sounds like, it was from the boiler fill inlet on the lower part of the boiler. The elbow fitting was finger tight and didn't seem to have any sort of thread sealant on it. My descaling had removed the scale that was helping to seal it up I think because it definitely got worse after the descaling.

    It may be an issue on this series of machine, or certain production dates, where they missed applying sealant or something.

    I would suggest taking it back and getting it addressed asap. It's too loud to ignore and will get worse, or, cause other problems in the machine eventually.

    Leave a comment:


  • brewy
    started a topic Rocket Giotto Evo R - potential issue

    Rocket Giotto Evo R - potential issue

    Hi all

    Got my Rocket Giotto Evo R back from its first service maybe a month ago. The machine will be 3 yrs old in October.
    It was a pretty costly service because I wasn't using the right water filter type and subsequently there was a lot of scale.

    Anyway, ever since I've had the machine back, there is a fairly constant hissing/boiling noise that I'm pretty sure wasn't there before.
    Seems still to make good coffee (only limited by my skills I'm sure) and hold the correct brew temperature.
    I do feel like I'm filling up the water reservoir more often that I used to, though.

    I have a video of what I'm talking about (turn the sound on). It's an iCloud link as the file was too big to upload directly:
    https://www.icloud.com/iclouddrive/0...mj44g#IMG_3749

    Would appreciate people's thoughts on if this is something that warrants taking the machine back to service place.

    Thanks in advance

    Tom
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