CR-10S Bed heating part way-Thermal Runaway

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SargeAsum
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CR-10S Bed heating part way-Thermal Runaway

Post by SargeAsum »

I need some help with this one. I got a used CR-10s and when I head up the bed, it will stop heating part way.

- I set the bed temp to 60 degrees and it will head to 51 degrees and then sit for a bit and give me a Thermal Runaway error.
- If I set the bed to 70 degrees it will go to just over 60 degrees and do the same thing.
- If I get the bed heated to 50 degrees and then change the setting to match the 50 degrees it will drop a few degrees and then give me the error again.
- voltage to the bed while heating is reading 51 V and then when it gets close drops to between 13-18 volts.
- I bypassed the connector that goes to the bed and into the housing and wired it straight to the board to rule out a bad connection point, the same issue.
- I wired in an MKS MOSFET, same issue.

Any ideas on what I should check next before I start buying and swapping out parts?
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LePaul
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Re: CR-10S Bed heating part way-Thermal Runaway

Post by LePaul »

Check your wires to see if they are loose.

I recently had a CR-10S do this and sure enough, the power leads were pretty wiggly

I would also check where the leads plug into the control board. Many China printers use tinned leads into the connection block, which isn't good and can even fail. I removed the tinned leads on mine and use ferrule connectors.

Check both ends before replacing parts!

I opted to replace my CR-10S bed with a new one. (https://amzn.to/3yhRLt3)
SargeAsum
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Re: CR-10S Bed heating part way-Thermal Runaway

Post by SargeAsum »

So that brings up an interesting point. The bed in the link is a 12v bed. The one on this printer is a 24v bed. Any Potential issue there?

Image

I did already remove the connector as I saw that could be an issue.
Image

Added link to images in google photos
https://photos.app.goo.gl/WHcqycHtS9F2XfXG8
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LePaul
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Re: CR-10S Bed heating part way-Thermal Runaway

Post by LePaul »

Yeah the CR-10S is a 12 volt bed (stock).

It looks like that machine has been modded a good deal. I noticed that firmware says "v2d2", did you make/compile that?

There are many posts on reddit about CR-10S and modding them for 24v. It can be done. It just means anything 12v on that machine has to be changed once you put a 24v power supply on that. Every cooling fan, part fan, hot end fan, the bed heater and hot end heater cartridge!
SargeAsum
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Re: CR-10S Bed heating part way-Thermal Runaway

Post by SargeAsum »

I did not compile it. I got it used and have only tried to fire it up and get it running. There was a Raspberry Pi with it but it was not hooked up. I'll try to reconnect that and see what happens.
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LePaul
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Re: CR-10S Bed heating part way-Thermal Runaway

Post by LePaul »

Might be an Octoprint setup

It sounds like you got ripped off - it's happened to me!
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