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jbruce12000 / kiln-controller

Turns a Raspberry Pi into an inexpensive, web-enabled kiln controller.
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Thermocouple Issue #178

Open gumboman4 opened 2 months ago

gumboman4 commented 2 months ago

I have been using kiln controller to run an older kiln without issues for a couple of years. I recently had an issue with the run ending at exactly the same time/temperature before I was unable to start a profile at all. I notice that the TC now constantly reads 32F when running test-thermocouple.py I am thinking my TC has failed? I have checked for continuity on wire from TC to boards and that checks out ok. I am using 31855 with a type K TC. Should I just go ahead and order a new TC? Or is there something else I can check?

chipgarner commented 2 months ago

You can check the thermocouple with a voltmeter on millivolts scale. 32F (OC) doesn't sound like a TC failure. Check the wiring from the 31855 to the Pi if you haven't already.

gumboman4 commented 2 months ago

I unplugged the 31855 completely and it's still just showing 32 F and the kiln hot icon illuminated. Would this mean the Raspberry Pi itself is damaged? The old TC was falling apart upon inspection. I have a replacement TC and Raspberry Pi I can try to swap out.

rondoc commented 2 months ago

When the 55 board is unplugged from the pi you will get 32F showing. My guess is that the 55 was not correctly plugged into the pi and/or the 55 board is not correctly powered. It's easy to misread the pinout on the pi. I use a template to avoid this. R.

On Thu, Jun 13, 2024, 4:14 PM gumboman4 @.***> wrote:

I unplugged the 31855 completely and it's still just showing 32 F and the kiln hot icon illuminated. Would this mean the Raspberry Pi itself is damaged? The old TC was falling apart upon inspection. I have a replacement TC and Raspberry Pi I can try to swap out.

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jbruce12000 commented 2 months ago

did you get this fixed with replacement hardware?

jbruce12000 commented 3 weeks ago

gonna leave this open one more week while waiting on a response