PSA:
I've been fighting my temperature control on reef-pi for months. couldn't figure it out. It almost always would start working again after I power cycled the pi, but for an unknown amount of time; sometimes several seconds, others for hours. But within a day or two (most often an hour or two), all three sensors would crap the bed, getting errors in the admin tab that the file didn't exist. the chart would have a zero point at the end and stop tracking temperature data. When I'd go look, the dropdown to pick the sensor would be empty as if nothing was plugged in. Then I'd reboot and they'd (almost always) come back, but not for long.
I saw someone recently on this thread with somewhat similar issues and they found one sensor was bad (the issue went away with one unplugged). I pulled two yesterday and... lo and behold, it was still reading today. I turned it off tonight and plugged in one more. Within a few minutes, the old problem was back. I swapped the 'new' one for the third one and I'm still going well a few hours later.
So...if you have temp sensor issues in your reef-pi, it's likely a bad sensor and you can diagnose by pulling one at a time.
FYI: all using the
@Michael Lane HAT
@Ranjib just FYI