Jump to content
Lex_B

Cherub brew group problem

Recommended Posts

Hi,

I'm after a bit of advice about my Cherub. It has been out of action for a few months while I moved house. When I finally got round to sorting the machine out and making my first coffee I found that no water would come out of the group head. The steam wand and hot water tap work fine, and the pump also comes on as normal and after a few seconds sounds like it is working against resistance to flow (the same sound as when back flushing). I have taken out the screen and brass bit but still no joy. Has anyone else experienced this or have any tips? I assume it has somehow blocked but I have no idea how to find/remove the blockage.

 

Fracino quoted me rather a lot to have it looked at so I will either try to fix it myself or sell it on for someone else to fix/ or parts, though it seems a shame for a machine that has had so little use.

Share this post


Link to post
Share on other sites

Based on what you said this sounfs like a block (calcification?) in main heat exchanger pipe or earlier.

Otherwise it could be a selonoid failure which directs water to heat exchanger.

Is there a metalic sound when you flick the brew pour button?


::: Fracino Cherub ::: Fiorenzato F5 ::: Torr 58.6mm ::: VST 18g basket :::

Awaiting: Arduino upgrade on Gaggia Classic, some skills ;)

Share this post


Link to post
Share on other sites

Probably the group solenoid valve' piston has stuck. Tapping the valve body might jolt it loose.

 

If you're good at DIY, then you can remove the valve, split the body open & descale it....

If not' then buy & fit a new 3 way solenoid valve (Ebay is your friend)

Share this post


Link to post
Share on other sites

Thanks for the replies. Sounds like it's worth investigating the solenoid valve first. I've not had the cherub to bits before but I'll give it a go!

Share this post


Link to post
Share on other sites

So I've had a look and the solenoid seems to be ok (holes all clear, springs ok), unless I'm looking for the wrong thing? Could it be the coil? Here's some pictures:

 

20190101_171747.jpg

 

If that's not the issue I'll have to start taking pipes out and checking for blockages. Any tips which pipes to take out first?

Screenshot_20190101-164425_Drive.jpg

20190101_171738.jpg

Share this post


Link to post
Share on other sites

* The coil can be checked with a multimeter. Or when the machine is switched on, a small screwdriver held close the the coil/valve shaft will detect the magnetic field if the coil is OK.

* Under the "mushroom" on the top of the grouphead is a small brass jet (FC129A). Descaling it may work (a 1/4" socket set is needed to unscrew the jet pillar)...try flooding the cavity with neat descaler solution.

* It's usually the top HX pipe - boiler to group head - which scales up first.

Share this post


Link to post
Share on other sites

This selonoid releases the back pressure after the shot, so its not the one you are after. There is another one inside the machine.


::: Fracino Cherub ::: Fiorenzato F5 ::: Torr 58.6mm ::: VST 18g basket :::

Awaiting: Arduino upgrade on Gaggia Classic, some skills ;)

Share this post


Link to post
Share on other sites

Check instructions with the page that shows the manifold.


::: Fracino Cherub ::: Fiorenzato F5 ::: Torr 58.6mm ::: VST 18g basket :::

Awaiting: Arduino upgrade on Gaggia Classic, some skills ;)

Share this post


Link to post
Share on other sites
* The coil can be checked with a multimeter. Or when the machine is switched on, a small screwdriver held close the the coil/valve shaft will detect the magnetic field if the coil is OK.

* Under the "mushroom" on the top of the grouphead is a small brass jet (FC129A). Descaling it may work (a 1/4" socket set is needed to unscrew the jet pillar)...try flooding the cavity with neat descaler solution.

* It's usually the top HX pipe - boiler to group head - which scales up first.

 

Thanks for the tips, I'll try the brass jet after the manifold solenoid. I may not need to take pipes off the boiler but I'll see how it goes

Share this post


Link to post
Share on other sites
Check instructions with the page that shows the manifold.

 

Cheers. Just saw the manifold solenoid! Oops. Bit trickier to get to but looks doable.

Share this post


Link to post
Share on other sites

You should at least be able to check if it flicks at all. Dissasembly is a bit tricky unless you take the whole of the cover off, than everything is nicely exposed. Get some correct size spanners to not damage the brass and ptfe joint tape to seal if you do go disassembling.


::: Fracino Cherub ::: Fiorenzato F5 ::: Torr 58.6mm ::: VST 18g basket :::

Awaiting: Arduino upgrade on Gaggia Classic, some skills ;)

Share this post


Link to post
Share on other sites

I have similar issues with my cherub. It does not sound like the noise when you are backflushing - there is some flow, but it is quite weak, and the pump noise fluctuates.

 

I descaled 6 weeks ago, so could well be a bit of dislodged scale which has stuck somewhere?

 

How should I best investigate? Is it ever worth descaling again to try to get rid of a partial blockage? I know a full blockage does not let descaler get into the places it needs to get, but with partial there may be a chance?

Share this post


Link to post
Share on other sites
Reviving an old post - is it fixed now?

 

Hi there, yes mine is fixed now (got round to it yesterday!). I disassembled and checked the inlet solenoid first, but realised after that it is in the line to the boiler fill (not hx pipe) and is closed when deenergised so shouldn't be causing no flow at grouphead. Also took off the manifold to hx pipe which was all clear.

 

Next up was the jet at the top of the brewgroup. The jet was blocked so I cleared it all up and now its running fine again. Thanks for all the tips.

 

20190428_132010_resized.jpg

20190429_180609_resized_1.jpg

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


  • About
    Coffee Forums UK is the UK's premier coffee forum Started in June 2008 by Glenn Watson, we now have more than 24000 mainly UK based members, and welcome more than 3000 members and visitors from around the world each day! With strategic investment and digital expertise from the Jackson Lockhart team (Tait Pollack and Adam Bateman), we are taking Coffee Forums UK to the next level, and are delighted to share the journey with you.

    New Members:
    We are often referred to as the friendliest forum on the web and we look forward to welcoming you onboard. Please read our Terms of Use.

    Advertising

    Coffee Forums Media Kit

    Click Here To Buy Advertising Space 
    £100 p/m when paid yearly, up-to: 690000 banner impressions per month!

    Donate / Sponsor

    Click Here To Donate (big thank you!)

    Get Your Supporter Badge Today (per year)

    image.png

×
×
  • Create New...