Heat bed fault

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SVG
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Heat bed fault

Postby SVG » Fri May 04, 2018 2:20 pm

I finished my RMax v3.2 kit build this week. Was a lot of fun.
After running a few prints I just started receiving a heater (bed) fault. The temp will steadily climb then the reading goes parabolic.
When I look at my thermistor glass bead I think it looks different now, like it has something cloudy inside it, although I’m not sure. I’ll attach a pic for reference.
Can I test it with a multi-meter?


SVG
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Xenocrates
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Re: Heat bed fault

Postby Xenocrates » Fri May 04, 2018 3:24 pm

Yes, you can test a thermistor with a multimeter. There are a few things to check. Make sure it is not shorting to the edges of the hole, that the solder joints are in good shape, and that the thermistor itself reads approximately 100K at room temperature.
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SVG
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Posts: 4
Joined: Wed Apr 11, 2018 10:49 am

Re: Heat bed fault

Postby SVG » Fri May 04, 2018 6:46 pm

Xeno, you were spot on. It must have been grounding itself to the bed. Since re-centering the probe all is well.

Thanks for the assist!

SVG


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