Question about DeLonghi Coffee Makers & Espresso Machines

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Mo steam or hot water

I have purchased thermal fuse and fitted in my delonghi 6700 the old one was open circuit stopping my steam being made for frothing milk it worked for one cup and went open cicuit again with new one fitted if I bye pass this thermal fuse the steamer works fine but I am concerned that the element must be getting to hot causing this to happen it makes coffee with no problem its just when you use the steam side it does not work and keeps making thermal fuse go open circuit the element reads 50 ohms and the coffee thermal fuse is fine even though it is located close to steam thermal fuse could you please help me with this fault and let me know what part is needed to rectify regards steve

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Check that the temperature sensor is working correctly. If it is covered in scale or otherwise faulty it may be causing the machine to leave the heat on longer than it should. If you have a multi meter use it to monitor the resistance through the ntc (providing the machine uses this kind of temperature sensor) as the temperature rises. It should be fairly linear. Try cleaning the sensor or replacing it. Also check to see if the heat is turned off when the water reaches the correct temperature.

Posted on Dec 14, 2014

Testimonial: "Hi thank you for getting back to me there is only one sensor on the element that I can see does this control the coffee temp as well as the steam temp as the coffee temp is working fine"

  • Inky Fingers
    Inky Fingers Dec 15, 2014

    The steam and hot water are usually made in the same boiler. An air gap is left above the water level and the water is boiled to fill that gap with steam. If there is only one element then that element must be the one switched on to produce the steam. The temperature sensor will be used in conjunction with a pressure sensor to control the water heater. It is quite likely that as the steam pressure drops and the heater is switched on to rebuild the steam that this is when the thermal fuse blows.

    There may be too little water in the boiler; allow machine to fill and heat for coffee then turn it off and allow it to cool. Purge all steam from the boiler. Check the water level in the boiler. Clean level probe(s). If water level is low check fill pump operation and water flow. There could be scale or obstruction reducing/stopping water flow.

    Use multi meter to check element turns off at correct temperature. If it does, check operation of steam pressure sensor. Sensor may be calling for heat to produce steam when pressure is already sufficient.

    You may wish to replace the temperature sensor and pressure sensor/regulator as a precaution anyway.

    I believe you are in the right area of investigation but just need to pin down the fault to a particular component. Let me know what result the above gives.

    There is likely just one temperature sensor - it may be an NTC type or a capillary thermostat type. The thermal fuse as you know is the secondary defender against overheating.

  • Inky Fingers
    Inky Fingers Dec 15, 2014

    The steam and hot water are usually made in the same boiler. An air gap is left above the water level and the water is boiled to fill that gap with steam. If there is only one element then that element must be the one switched on to produce the steam. The temperature sensor will be used in conjunction with a pressure sensor to control the water heater. UIt is quite likely that as the steam pressure drops and the heater is switched on to rebuild the steam that this is when the thermal fuse blows.

    There may be too little water in the boiler; allow machine to fill and heat for coffee then turn it off and allow it to cool. Purge all steam from the boiler. Check the water level in the boiler. Clean level probe(s). If water level is low check fill pump operation and water flow. There could be scale or obstruction reducing/stopping water flow.

    Use multi meter to check element turns off at correct temperature. If it does, check operation of steam pressure sensor. Sensor may be calling for heat to produce steam when pressure is already sufficient.

    You may wish to replace the temperature sensor and pressure sensor/regulator as a precaution anyway.

    I believe you are in the right area of investigation but just need to pin down the fault to a particular component. Let me know what result the above gives.

    There is likely just one temperature sensor - it may be an NTC type or a capillary thermostat type. The thermal fuse as you know is the secondary defender against overheating.

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