Question about Nuova Simonelli Mac 2000 I Group Espresso & Coffee Maker

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Boiler does not refill properly

The sight glass shows no fluid level. What causes this and how do I fix it?

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Chances are, your level probe (rhs of the boiler) is dirty/scaled.Then the probe is always earthed and does not allow water in as it thinks it's always full.
Take it out and clean with wire wool(obv with no pressure in the boiler).It should have a red wire attached to it.
When you refit it, make sure the part inside the boiler faces down.

Posted on May 08, 2009

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Posted on Jan 02, 2017

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hi. Im not sure excactly what is going on with your explaination about your machine, but I gather the the original mother board has died, and you have replaced it with a new one. It sounds like you have a water fill issue with your machine. If the boiler doesn't have enough water in it, then the pc board will shut the machine down. Ive never worked on a m39, but they are from the Faema corporation, and Faema/ La Cimbali electronics canbe very complicated. Dont now why they make such complicated electrics, cause there are hundreds of other brands with simple electrics.
If your boiler was empty, then the water fill cycle might be a timed cycle, and is shuting down before the water level has reached the water level probe inside the boiler. If this is the case, then once it has stopped, turn the machine off, wait 10sec, then turn it back on again and let it start the fill cycle over. You may have to repeat this a number of times until it has reached the water level probe inside the boiler. Some machines are designed to have a slow water fill, because when you draw hot water from the boiler for making tea, fresh cold water is pumped back into the boiler to replace what you have taken out, and if it fills too quick, then your steam pressure drops. So by filling slower, the machine will maintain its steam pressure. Good idea in theroy, but its only good for cafes that do 300 coffees per hour.
Im hoping that your machine is configered this way, cause it will probably just have to be turned on a few times until it has reached the water level probe as I explined in the begining. If you have a sight glass, you can check to see how high your water level is. If your level is correct, and its still not working right, then id recomend calling a repairer. There are number of things that could be wrong, causing your board to die. Faulty solenoids. switches, touch pads, pressure switches can cause main board issues. Hope all this helps with getting your machine working properly. Dazza Repairer

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1 Answer

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