I spoke to a customer today who had just returned from a months holiday; he went to make a coffee on his newly purchased espresso machine only to find that the water refused to come through the group head despite the water tank being full, and the pump operating correctly.
What happened?
Well I've experienced this on a number of occasions. What's happened is that there is an air lock in the boiler, which means that the pump is unable to transfer the water in the tank through into the boiler. I'm not sure why it happens, but it can occur on both commercial and domestic machines.
What is a little disconcerting is that the thermostat appears to show that everything is ok. On a domestic machine this means the LED light changes from red to green, whilst on a commercial machine, the needle on the dial will show that one bar pressure has been achieved.
The solution with regard to the commercial machine is simple. Simply open the steam wand valve. You get an initial surge of steam, however this rapidly declines to nothing, and the dial needle will quickly fall back to zero, before once again the pressure begins to rise. This time it will be the water that is being heated, and not just air.
Domestic machines are a little more fun! First of all make sure that the machine is switched of, and ensure that the water tank is full. Now open the steam wand control to its fullest extent. Next switch on the machine and immediately press or switch on the control that is used to make a coffee. Rather than the water coming through the group head it will start to pour out of the steam wand. When this starts to happen shut the steam valve; water will now start to come through the group head. Now switch off the coffee making button or switch and let the machine heat up normally.
You should find that everything will now operate properly and you will be able to enjoy that wonderful brew.
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9 comments:
If you produce lots of coffee having an programmed coffee machine, you'll need to find out just how to clean it properly. delonghi esam3300 magnifica super-automatic espresso/coffee
I really love having some air lock on my espresso machine! It truly works wonder over my morning making the best espresso machine!
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