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Duetto Mk IV small leak

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My Duetto has developed a small leak in the back right hand corner as looked at from the front. Only occurs when the machine is on, does anyone have an idea as to what this may be. The machine seems to work fine apart from this, it is about 3 or 4 years old.

Many thanks for you help

Paul


Alex Duetto, Mahlkonig Vario, Goldfinger Tamper, Motta Jug

Trained by Glenn!

:):):coffee::coffee:

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Is this leak right at the back or just forward of the rear?

It could possibly be leakage from the anti vac valve on top of the boiler, they can sometimes stick or the seat may be worn.

One other thought, if the machine has not been de-scaled and the water level probe is contaminated with scale the water level may be getting too high and allowing water to bubble close to the vac valve.

Remove the level probe and check for scale. Remove vac valve and check the seat / seal. Do not over tighten the case screws on re-assembly.

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Machine off & cold

Remove lid

Get a torch & switch machine on

Watch everything carefully & listen as machine heats up....you should then spot the leak.

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Thanks very much, I will have a look


Alex Duetto, Mahlkonig Vario, Goldfinger Tamper, Motta Jug

Trained by Glenn!

:):):coffee::coffee:

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Did you find your leak? I have exactly the same problem.


Izzo Alex Duetto | Ceado E37s | Minor obsession with home automation

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Did you find your leak? I have exactly the same problem.

 

Always a shame when people never post back on a thread with the results, as when people like yourself look for a solution, it's very unsatisfying.

 

Machine off & cold

Remove lid

Get a torch & switch machine on

Watch everything carefully & listen as machine heats up....you should then spot the leak.

 

The above was good advice, have you done it and what was the result?


ACS Vesuvius DBPP, Izzo Duetto DB, Minima DB, Lelit Bianca Prototype DB (paddle flow control) BTC Machines: Roasters: Amazon Dalian 1kg Drum Roaster, other failed roasters: Grinders: Ceado E92, Niche US and UK: 145kg assorted greens: My reviews at https://coffeeequipmentreviews.wordpress.com/

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I'd already done this and can't see the leak, nor can I find any witness stains to point me in a direction! Admittedly it was only a cursory check, then I turned to google!


Izzo Alex Duetto | Ceado E37s | Minor obsession with home automation

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I'd already done this and can't see the leak, nor can I find any witness stains to point me in a direction! Admittedly it was only a cursory check, then I turned to google!

 

I'd advise you to do a little more than a cursory check, because otherwise you will not get a very useful answer.

Edited by DavecUK

ACS Vesuvius DBPP, Izzo Duetto DB, Minima DB, Lelit Bianca Prototype DB (paddle flow control) BTC Machines: Roasters: Amazon Dalian 1kg Drum Roaster, other failed roasters: Grinders: Ceado E92, Niche US and UK: 145kg assorted greens: My reviews at https://coffeeequipmentreviews.wordpress.com/

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I think I've found the leak. It's a small occasional drop that's then pooling on the front of the two removable metal plates. That makes it look worse as it accumulates and then pools on the worktop.

 

The picture is looking up at the bottom of the steam boiler and you can see a droplet forming on the large nut near the elbow.

 

4c73a03be429d19dcdcb128c519b1afc.jpg

 

Any suggestions on how to approach fixing it?


Izzo Alex Duetto | Ceado E37s | Minor obsession with home automation

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The large nut and flange is the heating element, it is the seal on the heating element that is leaking. You will need to obtain a new seal, remove the heating element, clean the threads and flange of any scale formation then replace. Take care when replacing the seal as they can move off centre and leak. The nut is usually 1 1/2" AF 38 mm AF. Also check the terminals as the one looks over heated /charred. May need new connector.

 

P.S. Hold the boiler carefully as the element may be very tight.

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