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Isomac Millenium II boiler doesn't heat
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Mirton
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Joined: 7 Mar 2014
Posts: 6
Location: United States
Expertise: I love coffee

Espresso: Isomac Millenium II
Grinder: Ascaso i1
Posted Fri Mar 7, 2014, 10:15am
Subject: Isomac Millenium II boiler doesn't heat
 

Hello long time lurker and first time posting. I've been relying on the website for advice for quite some time. I'm on my third espresso machine, and Isomac Millenium II purchased used on Craiglist. I previously owned an Nuova Simonelli Oscar which was solid for two years, and a vintage Saeco Rapid Steam SS. I was descaling the Millenium yesterday, mixed citric acid in the tank, pressurized the group head with a blind basket turned it off and let it sit for little less than two hours. Then i started flushing the water through the hot water wand, and group head, back flushed the machine a few time, there was a lot of buildup water was very blue. I was in the process of rinsing, going through my 3rd tank of fresh water, when the machine stopped running water through the hot water wand. I also noticed that the group head was cooling down, the boiler going cold. I opened the body up and was peeking inside, there are no leaks or noticeable issues.

The Cruzel (GN) box light turns green. Both red lights turn on when powered. Pump works when activated, cold water come off the grouphead.

I'd appreciated if you could give me any advice on what might be have gone wrong. My first reaction was that the thermal fuse had gone off, or its the heating element. I'd appreciate some advice on testing the electronics with an voltmeter which i plan to purchase today.
-much obliged
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stefano65
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stefano65
Joined: 30 Oct 2004
Posts: 1,404
Location: Eugene OR
Expertise: Professional

Espresso: Vibiemme,Elektra,
Grinder: Vario,Macap,
Vac Pot: not
Drip: not
Roaster: not
Posted Fri Mar 7, 2014, 11:50am
Subject: Re: Isomac Millenium II boiler doesn't heat
 

Start with continuity check on the thermal cut-off
if well check the ohm on the HE removing the wires
finally check IF voltage arrives on the HE terminal

 
Stefano Cremonesi
info@espressocare.com
www.espressocare.com
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Mirton
Senior Member


Joined: 7 Mar 2014
Posts: 6
Location: United States
Expertise: I love coffee

Espresso: Isomac Millenium II
Grinder: Ascaso i1
Posted Fri Mar 7, 2014, 12:00pm
Subject: Re: Isomac Millenium II boiler doesn't heat
 

thank you for the suggestions, i'll try this afternoon.
-regards
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Mirton
Senior Member


Joined: 7 Mar 2014
Posts: 6
Location: United States
Expertise: I love coffee

Espresso: Isomac Millenium II
Grinder: Ascaso i1
Posted Fri Mar 7, 2014, 1:19pm
Subject: Re: Isomac Millenium II boiler doesn't heat
 

stefano65 Said:

Start with continuity check on the thermal cut-off
if well check the ohm on the HE removing the wires
finally check IF voltage arrives on the HE terminal

Posted March 7, 2014 link


I ran a continuity check on the thermal cut-off, it started beeping. Looks like a need a replacement one. Thanks for the assistance, regards
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Mirton
Senior Member


Joined: 7 Mar 2014
Posts: 6
Location: United States
Expertise: I love coffee

Espresso: Isomac Millenium II
Grinder: Ascaso i1
Posted Fri Mar 7, 2014, 1:38pm
Subject: Re: Isomac Millenium II boiler doesn't heat
 

I ran the following diagnosis:

I ran continuity check on the thermal cut-off, it started beeping which means the fuse is shot, needs to be replaced.
I checked the voltage on the heating element with power one, it read 56.6 V.
I checked the ohm on the Heating element the multimeter reads 1, which it means there's no resistance.

Are both the heating element and the thermal cutt-off bad?
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