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Thermostat suddenly broken (VBM)?

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  • Thermostat suddenly broken (VBM)?

    Hi!

    I have got a VBM Piccolo with an adapter to have a thermocouple measure the temperature inside the E61 group (a al Eric).

    Machine has been producing water with a temp. around 94 degrees for weeks after I fine tuned the thermostat setting and then one day was faaar too hot. Steam and water splattering out of the group, temperature measured to well above 100 degrees.
    Did not resolve itself through switching on/off and waiting for a day.

    So I played with the thermostat setting and had to turn it almost half a turn, which is huge on this machine.

    Now the temp seems stable (several days past) at around 94C but I am very suspicious that the thermostat has had it.


    Has anybody any idea what could cause this? Anyway to test the thermostat? Or should I just order a new one as the old one is on its way out? The machine is prob. 3-4 years old.
    Turning it will turn the heater on and off, so it is working, but this huge jump cannot be normal.

    Thanks for your opinion!

    Werner

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