Question about DeLonghi DCU72 Coffee Maker

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Element won't get hot, used multimeter seems circuit board is no allowing element to heat,

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I have the same problem.
I disassembled the bottom of the coffee maker, and unscrewed
the bracket holding the circuit card.
I cut the input power and ground wires from the plug to the card, and detached its modular wire for the heating element.
I removed the card (to take to lab for further debugging).
Then I bought some .25 inch modular tab connectors at the hardware store and attached one to the power wire formerly going to the circuit card. I attached this to the heating element.
I covered the spare ground wire with electric tape.
Now I have a coffee maker which brews coffee again (except that I must pull the plug to shut it off). I must be careful not to let the
water boil away, but that is usually not a problem.
If I figure out what is wrong with the circuit card, I will update you.
It has a microprocessor, and I am not optimistic about replacing
that (with the right program in it). If it is the triac (the component
with the big block heat sink), it can be done.

Posted on Feb 08, 2009

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First check the hi-limit thermostat (90percent of the time this is the problem)...If that is the problem the part number is 2T-47499. Next check the Element for continuity with an ohm meter, if it is bad you will need to order a new one. Be sure to check the wattage, Some of the 120v brewers have a 1500w element and some have an 1800w element . Either can be used on the 120v machine. The 1800 watt element is a bit faster in heating. If you have the 220/240v machine you will have to order a "coil" shaped element. That is a 3500w element. There is a third problem possible and that is the Thermostat. The capilary tube could be broken (happens in the lime/rust/sulpher belt of the midwest)..If you know how to use an ohm meter you can find the problem quickly. I have a video on checking a Bunnomatic temperature, heater and hi-limit circuit, maybe it will help. https://www.youtube.com/watch?v=tNVZkYPaZko
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I did this very same thing on my DeLonghi Coffee machine just last week. The Element was open circuit.
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you will need a Multimeter to measure... you will also need a phillips screwdriver and a Security torx bit to take the bottom cover off..

From there "CAREFULLY" put your meter on AC volts, and measure across the element... one side of the element has a white wire and the other side is going to one of the in-line thermistors... if you read 120 ish volts, then the element is shot... If it doesnt read anything, then keep one lead on the white wire while you trace back to the next thermistor for 120, then again trace back to the final thermistor... which is thermally connected to the element, that's the final one. If you still have no 120 volt, then the logic circuit is not firing the Relay on the PCB.

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1 Answer

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Picture showing burnt out heater element and top removed from X5

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I have the same problem.
Being an electrical engineer, I would like to debug the circuit card.
However, I would like to brew coffee also.
I disassembled the bottom of the coffee maker, and unscrewed
the bracket holding the circuit card.
I cut the input power and ground wires from the plug to the card, and detached its modular wire to the heating element.
I removed the card
(to take to lab for further debugging).
Then I bought some .25 inch modular tab connectors at the hardware store and attached one to the power wire formerly going to the circuit card. I attached this to the heating element.
I covered the spare ground wire with electric tape.
Now I have a coffee maker which brews coffee again (except that I must pull the plug to shut it off).
If I figure out what is wrong with the circuit card, I will update you.

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