I just purchased a used Nuova Simonelli Mac 200v single group espresso machine for my cafe. I love it, but I feel like the boiler pressure is low, preventing me from pulling a really good shot. It won't go up past 4 bars and I feel like it should really be at around 7-9 bars. Does anyone know how to adjust this. My steam pressure is ideal, right at 1.2 bars. There are no leaks in the machine either.
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Re: Boiler pressure low
You said you clean the machine with vinergar or descaller use descaller vinegar not strong enought descaller melt the calcium vinergar remove it in chunks and can still be block after the cleaning and dont forget maybe the person who had that before you never did maintenanse on it descal it a few time let me noww pierre and how do you descalled it thanks
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Could be lack of water in the boiler, could be a faulty pressure stat or vent valve. Check the level probe first, then the vent valve and then the pressure stat. You can also use the manual fill to make sure water is getting to the boiler.
Boiler is contaminated with milk, check the water from the tea valve, if it smells the same or has swimmers, boiler needs to be descaled, if no floaties then removes steam wand and soak in purocaff for a few hours, then clean. Always flush ssteam wand before and after every drink.
I had the same problem of the boiler filling up all the way with water and the water was coming out of every hole in the machine. Turn the machine off, drain the boiler completely, MAKE SURE VALVE #2 is CLOSED, this is the one under the drip pan all the way to the left. Turn on the water supply to the system and turn the system ON. The cup warmer on top will come on and stay on for anywhere between 10 to 20 minutes..... let it be,,, do not turn it OFF,, it will go off automatically. That should do it!
It sounds like the thermostat on the boiler nest to the element tripped. Fill machine with water until you can see the level about half way, then open the right side of the espresso machine, you might be able to get to thermostat from the top of machine (make sure it is unplugged) then press the red pin on the boiler between the 2 wires, that should reset the thermostat, if it does not then it will need to be replaced. As for the water on the top of the group head, is there any way you can post a pic of the top, because simonelli made a few different head and I want to give you the correct advise.
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.