Thermocouple Issue

[gumboman4]

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]

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]

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]

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. — Reply to this email directly, view it on GitHub <#178 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AXA65GZUCJGIUENKPLIZMRDZHIRT3AVCNFSM6AAAAABJHLQ5MCVHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHMZDCNRWHEZTKOBXGU> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[jbruce12000]

did you get this fixed with replacement hardware?

[jbruce12000]

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