Isomac Millennium troubleshooting


Rimmie

Member
I ran the machine with the steam wand switched on for 20 minutes and then for another 20 without it once it started giving out steam. And then, I opened up the water tap but, nothing changed.
Although, I think the pump was running most of the time for those 40 minutes and then, it started tripping the circuit breaker immediately when switched on.
Maybe the pump broke?
 

Jonken

Well-known member
The pump is only meant to run for 1, maximum 2 minutes, so yes if there is no internal leakage it sounds plausible that it broke.
 

Wilderwein

Well-known member
Oh maybe. They are not designed to be on for that period of time. It's recommended to run them 1 min and then wait 2 min to let it cool down
 

Rimmie

Member
Surprisingly the pump works and the machine didn’t trip the circuit breaker today yet. But, same old issue with water out the drain and steam pressure shooting to max as soon as the machine is ON.
Guess, need to check the water level sensor perhaps then .
 

Grindmaster Flash

Well-known member
Some questions to find the cause.
1. You write the pressure goes to max immediately.
Do you mean right after the machine is turned on (seconds) and thus cold, or do you mean pressure continues up right after the warm up period for a few minutes?

What happens when you start brewing? In a normal e61, this should close the gaskets for the drain. But I dont know this machine.

If you pull out the plug from the 230v first (important for your safety) can you measure the resistance in the boiler heater. I had a friend with a broken heater with kind of similar problems. Measure also from each terminal to some grounded part and note the values.
Read the power on the machine and calculate if the boiler resistance is correct (roughly P=U^2/R, where U is 230V)

In his case the heater was broken halfway and got earthed through the water in the boiler. I solved the problem with this measurement. The machine behaved irregular sometimes and eventually boiled like crazy, since the voltage acted upon half of the resistance, it put out the double power. And the scary part was that it never shut off when this happened. The OPV spat hot water and steam all over the kitchen.

I hope your’s is not broken this way though.
 
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Rimmie

Member
Some questions to find the cause.
1. You write the pressure goes to max immediately.
Do you mean right after the machine is turned on (seconds) and thus cold, or do you mean pressure continues up right after the warm up period for a few minutes?

What happens when you start brewing? In a normal e61, this should close the gaskets for the drain. But I dont know this machine.

If you pull out the plug from the 230v first (important for your safety) can you measure the resistance in the boiler heater. I had a friend with a broken heater with kind of similar problems. Measure also from each terminal to some grounded part and note the values.
Read the power on the machine and calculate if the boiler resistance is correct (roughly P=U^2/R, where U is 230V)

In his case the heater was broken halfway and got earthed through the water in the boiler. I solved the problem with this measurement. The machine behaved irregular sometimes and eventually boiled like crazy, since the voltage acted upon half of the resistance, it put out the double power. And the scary part was that it never shut off when this happened. The OPV spat hot water and steam all over the kitchen.

I hope your’s is not broken this way though.
Yes, the steam pressure shoots up immediately as soon as the machine is switched on. I haven’t tried to brew while facing this problem. Yes, I can check the resistance although, I think the coil was just replaced. Thanks for the insight!
 

Wilderwein

Well-known member
Ok. New theory: It's a small amount of water in the boiler. The machine tries to fill it up but the pipe in to the boiler is jammed due to scale. And the opv kicks in.
 

Grindmaster Flash

Well-known member
Yes, the steam pressure shoots up immediately as soon as the machine is switched on. I haven’t tried to brew while facing this problem. Yes, I can check the resistance although, I think the coil was just replaced. Thanks for the insight!
If the pressure rise directly at power on. Then it cannot be a boiler heater error since the water is cold. So dont bother to measure resistance.
Then I think it must be the pump pressure you see on the manometer. How can that be…. Scale or non working valve… it is a single boiler thermosyphone machine right?

With a little thinking. The solenoid valve is probably broken that shall direct the water from the pump to either fill the steam/hot water boiler or to brew coffee. Thus it tries to fill the boiler that has a low level, but falsely directs the water to the brewer thermosyphone instead. And that is why the brew pressure rise and you hear the pump humming.

Find that valve…

If you operate the brew handle it ”should” come out water through the brew head in this condition i believe.

My best guess.

/T
 
Senast ändrad:

Rimmie

Member
Did you find the cause to your problem?
Hi! Yes and no.
There is nothing wrong with the machine. We took it apart and checked. It worked fine in the workshop where I took it. But, it has problems working in my apartment. I have called an electrician to get it checked. Waiting for their visit.
I will update once they find out what the issue is :)
 

Wilderwein

Well-known member
Oh my. Maybe they swapped place between earth and the live line. I have seen that happen once and I'm still great ful no one got hurt.
 

Rimmie

Member
Oh my. Maybe they swapped place between earth and the live line. I have seen that happen once and I'm still great ful no one got hurt.
So, finally had the electrician check the connections. No problems there also. The polarity just changed depending on how the machine was plugged in. Quite silly! It still shuts down the circuit breaker if the machine is kept running for long. At least the machine is working now :)
Just wanted to update you all!
Thanks for all the help with the troubleshooting :)
 

Estrobeda

Member
So, finally had the electrician check the connections. No problems there also. The polarity just changed depending on how the machine was plugged in. Quite silly! It still shuts down the circuit breaker if the machine is kept running for long. At least the machine is working now :)
Just wanted to update you all!
Thanks for all the help with the troubleshooting :)
Tbh I'd still be a bit concerned about the circuit breaker flipping. So, is it the actual fuse that goes off or is it the earth leakage circuit breaker? If the first, you're more than likely overloading the cables (which would be not ideal but not that concerning tbh) but if you flip off the earth leakage circuit breaker then I'd be concerned about potential exposed wires or some such that occasionally touch the casing which could be dangerous.
 

Rimmie

Member
Tbh I'd still be a bit concerned about the circuit breaker flipping. So, is it the actual fuse that goes off or is it the earth leakage circuit breaker? If the first, you're more than likely overloading the cables (which would be not ideal but not that concerning tbh) but if you flip off the earth leakage circuit breaker then I'd be concerned about potential exposed wires or some such that occasionally touch the casing which could be dangerous.
I think it's due to overloading..
 

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