1 Topic by aestheticus (edited by aestheticus 2015-09-01 18:10:26)

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Topic: Sudden print stop, temperature reads "DEF"

I was printing just fine and suddenly two hours into a print, the temperature jumped up to over 300, it went idle, and stopped. The temperature now reads "Def" and won't work. Restarting the printer only results in huge temperature jumps before it reads "Def" again. I've done some research on this here and at voltivo.

From what I've gathered, it's a safety feature to prevent over heating and fires. The issue itself sounds like a bad connection. I have the 1.0A with the white connector that should be less prone to failing. Before I start checking every wire and connection on the board, could anyone that has had this problem before tell me which wires to check, what the reading should be, and what the fix is?

Do I just re-solder the bad connection? Put in a new wire? Not sure if it matters or not, but the RTV silicone holding the thermistor in has also fallen off. I doubt that would cause a sudden and abrupt peak in temperatures though.

Thanks!

2 Reply by carl_m1968

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Re: Sudden print stop, temperature reads "DEF"

aestheticus wrote:

I was printing just fine and suddenly two hours into a print, the temperature jumped up to over 300, it went idle, and stopped. The temperature now reads "Def" and won't work. Restarting the printer only results in huge temperature jumps before it reads "Def" again. I've done some research on this here and at voltivo.

From what I've gathered, it's a safety feature to prevent over heating and fires. The issue itself sounds like a bad connection. I have the 1.0A with the white connector that should be less prone to failing. Before I start checking every wire and connection on the board, could anyone that has had this problem before tell me which wires to check, what the reading should be, and what the fix is?

Do I just re-solder the bad connection? Put in a new wire? Not sure if it matters or not, but the RTV silicone holding it in has also fallen off. I doubt that would cause a sudden and abrupt peak in temperatures though.

Thanks!


If the RTV has fallen off an it allowing the exposed wires of the thermistor to contact the heat block or each other it will cause your issue.

Printing since 2009 and still love it!
Anycubic 4MAX best $225 ever invested.
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3 Reply by aestheticus (edited by aestheticus 2015-09-01 18:54:52)

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Re: Sudden print stop, temperature reads "DEF"

carl_m1968 wrote:
aestheticus wrote:

I was printing just fine and suddenly two hours into a print, the temperature jumped up to over 300, it went idle, and stopped. The temperature now reads "Def" and won't work. Restarting the printer only results in huge temperature jumps before it reads "Def" again. I've done some research on this here and at voltivo.

From what I've gathered, it's a safety feature to prevent over heating and fires. The issue itself sounds like a bad connection. I have the 1.0A with the white connector that should be less prone to failing. Before I start checking every wire and connection on the board, could anyone that has had this problem before tell me which wires to check, what the reading should be, and what the fix is?

Do I just re-solder the bad connection? Put in a new wire? Not sure if it matters or not, but the RTV silicone holding it in has also fallen off. I doubt that would cause a sudden and abrupt peak in temperatures though.

Thanks!


If the RTV has fallen off an it allowing the exposed wires of the thermistor to contact the heat block or each other it will cause your issue.


As always, Carl, your knowledge of DaVinci is respected and appreciated. Recommended fix being to pull the thermistor out, coat it in RTV, and stick it back in?

Also, what kind of RTV would you recommend? I see Red, Black, Copper, White, Grey, and other varieties.

I also happen to have some thermal paste and kapton tape laying around if those would be of any use to fixing this.

4 Reply by mark.burton

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Re: Sudden print stop, temperature reads "DEF"

I don't think the thermal past will be of much use if your thermistor has come off or if the wires are exposed.

You can use the kapton tape instead of rtv. that is how they used to do the  e3d v6. use the tape to insolate the wires and then to tape it to the head.  If you go this rout make sure it is tight against the head.