Question about ECM Giotto Espresso Machine

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Ecm Giotto symptoms The machine overheats, once before replacing the pressure switch solved the problem.This time however after the installing the new switch only the pump worked not the heater. I reinstalled the old switch and it once again overheated. I called Burgess Enterprises in Seattle and they sent me out another switch but after installing it the same results as the first replacement occurred.

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Most single boiler home espresso machines have both a coffee and a steam temperature thermostat. For overheat protection many machines use a thermal fuse, which must be replaced by a service technician in the rare event that it is 'tripped'. Other machines, such as Rancilio use a resetable safety thermostat, which like a circuit breaker can be reset by the handy homeowner.
Very high-end home machines (ECM Giotto, Rancilio S24) using the heat exchanger system use an adjustable pressurestat, which besides being extremely reliable allow for infinite pressure and temperature adjustment. The overpressure safety system on these machines is usually a spring type safety valve.


Posted on Feb 14, 2008

  • Priya darshan Feb 14, 2008

    Worst case failure:

    All expresso machines use a
    pressurestat -- really little more than an diaphragm and a spring
    attached to a switch. -- in some cases this switch operates a solid
    state relay, to offload the job of switching the 10 or 12 amp load from
    the heater.

    All epxresso machines have a safety valve, generally
    shipped with a certificate and serial number as its perfomance is so
    highly critical.

    After possibly performing erratically, a pstat will usually fail ON. which results in the following:

    Excessive steam and water pressure blows out through the relief valve, continuously, making a fearsome racket. . . .

    Until all the water in the water tank is exhausted, due to the autofill box calling for more water. Flooding results.

    boiler, now dry, the thermal fuse or Hi temp overload thermostat cuts
    power to the heater and in some cases the pump (which may be running
    dry now and will over-heat and if a cutout is not provided (Ulka) will
    burn out.

    OR, if the unit is plumbed-in, the process continues
    indefinitely, continuing to flood the area. At some point hopefully,
    due to internal current leakage, a wall mounted GFCI receptacle, or
    breaker, will drop power to the unit.

    bottom line advice is
    if you even suspect a pstat issue, replace it IMMEDIATELY. and don't
    leave your machine on when no one is home.


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Have you checked the Thermostat on the unit in the tank if it is stuck it will cause the tank to over heat and pop off the steam valve?? there should be some resettable overheat protectors as well. Has the preassure relief valve been replaced as well??

Posted on Feb 14, 2008

  • Gary Davd
    Gary Davd Feb 16, 2008

    Hey Cool guy where did you copy and paste that info from?? some of that does not apply on his unit..



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I am having a similar problem.  Doesn't happen all the time, just sometimes.  My research has led me to believe it might be the vacuum breaker valve.  I am going to order a new one here:


I'll replace mine & post if it fixes it.


Good Luck

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