Ridiculous High hotend temp reading

Hi!
i bought a new hotend (chines e3d v6) and get a temp reading of 1170C-1244C.....
the hot end is cold and when i set it to 200C its still cold and the temp reads the same as b4.
is the heatercartridge and thermistor broken or is it for 24v.....

any tips is welcomed

Sounds like either you have the heater and thermistor wires swapped over, or the thermistor on that hot end is shorted, or you have a short in your hot end wiring.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

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dc42
Sounds like either you have the heater and thermistor wires swapped over, or the thermistor on that hot end is shorted, or you have a short in your hot end wiring.

the original hotend is wierd the same as this one and it works.
if only the thermistor is shorted wouldent there be some kind of life in the heatercardridge?

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denshine
if only the thermistor is shorted wouldent there be some kind of life in the heatercardridge?

If it's reading above the set temperature (as it is), then the Duet will refuse to power the heater. My suggestions:

1. Disconnect the thermistor wires from the Duet.

2. Measure the resistance between the thermistor wires with a multimeter. Also use the multimeter to check that there is infinite resistance between the thermistor wires and the metal body of the hot end.

3. If you want to test the heater, you could try commanding the temperature to 1300C. My firmware fork will refuse to do this, but AFAIK the official RRP firmware and zpl's fork have no temperature limit. Alternatively, temporarily wire a 100K resistor across the thermistor pins on the Duet. This should give a reading of 25C and allow the Duet to power the heater. Warning! there will be no feedback to tell the Duet to cut the power, therefore if you command it to any temperature greater than the reading and leave it for too long, you will burn out your hot end.

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Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].

ohuu... i have a micrometer but have no ide how to use it...lol. (guess its time to youtube micrometers...)

i found 10 new thermistors on ebay for about 3usd so if i cant learn how to use the micrometer i got a backup

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denshine
ohuu... i have a micrometer but have no ide how to use it...lol. (guess its time to youtube micrometers...)

i found 10 new thermistors on ebay for about 3usd so if i cant learn how to use the micrometer i got a backup

It is almost certainly an electrical fault rather than a problem with the mechanical size of the components, so a micrometer will not help you much. You need a multimeter, e.g. [uk.rs-online.com]

Dave

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dmould

Quote
denshine
ohuu... i have a micrometer but have no ide how to use it...lol. (guess its time to youtube micrometers...)

i found 10 new thermistors on ebay for about 3usd so if i cant learn how to use the micrometer i got a backup

It is almost certainly an electrical fault rather than a problem with the mechanical size of the components, so a micrometer will not help you much. You need a multimeter, e.g. [uk.rs-online.com]

Dave

hehe yeah thats what i meant.....i got a multimeter...lol

the thermistor was broken, i have replaced it with a new one and it works perfect.