Isomac Millennium troubleshooting


Rimmie

Member
Hello again!

so, I finally bought a re-serviced Isomac millenium machine but have run into an issue. when I turn ON the machine, the steam pressure goes to the extreme limit (max side) immediately and water starts to come from the drain. this is accompanied by a loud humming sound. any clues as to what might be causing this?
Since I’m new to e61 machines, any help or suggestion is appreciated.
Thanks!
 

Bilagor

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Wilderwein

Well-known member
I think it's the vacuum breaker that is stuck. If you open the steam wand does it loses pressure immediately and then function normally after that?
 

Wilderwein

Well-known member
Hello again!

so, I finally bought a re-serviced Isomac millenium machine but have run into an issue. when I turn ON the machine, the steam pressure goes to the extreme limit (max side) immediately and water starts to come from the drain. this is accompanied by a loud humming sound. any clues as to what might be causing this?
Since I’m new to e61 machines, any help or suggestion is appreciated.
Thanks!
I didn't watch the movie. But now i did. Strange. I must think a bit.
 

Rimmie

Member
Do you have guarantee? I mean he should have noticed
No guarantee as such but, when I tried out the machine there, it didn’t have any issues. Don’t know what went wrong. The only thing I did after getting the machine was to backflush it. Anyway, I have been in touch with him and he suspects that the pump needs to be replaced.
Maybe I will try it again tomorrow to see if it works.
 

Jonken

Well-known member
My guess is that the water level sensor is not working, so the autofill doesn't know when to stop filling the boiler and instead water is routed to the drain by the over pressure valve to protect the boiler.

The humming noise sounds normal for a vibratory pump.

You could check the level sensor for limescale, although perhaps it's better just to have the tech have a look at it considering that you might have grounding issues.
 

Rimmie

Member
My guess is that the water level sensor is not working, so the autofill doesn't know when to stop filling the boiler and instead water is routed to the drain by the over pressure valve to protect the boiler.

The humming noise sounds normal for a vibratory pump.

You could check the level sensor for limescale, although perhaps it's better just to have the tech have a look at it considering that you might have grounding issues.
Yes, if I’m unable to get it to work again tomorrow, then I’ll have it checked.
 

Rimmie

Member
If I keep it switched off for a few days, will it be okay if the water level stabilizes or does the sensor need to be replaced?
 

Jonken

Well-known member
Do you think that it could have happened during transporting the machine?
Sure, something could've come loose by vibration during transport. This video explains what to check for:

(newer machine, but it works the same way)

269_is_elec3.jpg

Well, except that there are more connections in your Isomac. Check the green and yellow wires* and their connections and if it looks good make sure your probe isn't covered in scale or by a tube.

*in the diagram, actual color may differ.
 

Mayhem

Well-known member
I think Jonken is right. It overfills the the boiler.
If the boiler is immediately overfilling (due to faulty water level sensor) when turned on from a cold state, water should not be pouring out through the OPV and into the drain. Water would be leaking out of the top of the boiler through the vacuum breaker, unless the latter is also stuck closed I suppose…
 
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Rimmie

Member
Sure, something could've come loose by vibration during transport. This video explains what to check for:

(newer machine, but it works the same way)

269_is_elec3.jpg

Well, except that there are more connections in your Isomac. Check the green and yellow wires* and their connections and if it looks good make sure your probe isn't covered in scale or by a tube.

*in the diagram, actual color may differ.
Thanks! I will check this out.
 

Rimmie

Member
If the boiler is immediately overfilling (due to faulty water level sensor) when turned on from a cold state, water should not be pouring out through the OPC and into the drain. Water would be leaking out of the top of the boiler through the vacuum breaker, unless the latter is also stuck closed I suppose…
I didn’t find any leaks inside the machine as such.
 

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