I have a an STC-1000 (Mangrove Jack's one) connected to my brew fridge and heat pad. I've done many brews with this setup without any issues. Today I was cold crashing my IPA and the temperature was stuck on around 10.5-11.5C according to the STC, but the top of the beer had ice on it and my IR temperature gun was reading temperatures below freezing. I unplugged the STC-1000 and reconnected it (at one stage I had it fully unplugged for hours) and it's still doing the same thing.
I then replaced it with another STC-1000 and that controller is reading the correct temperature as expected.
I took the "faulty" STC-1000 into my bedroom and it's reading accurately according to 2 other thermometers I have. I put the temp probe outside the window even and it's reading around 8C, just what it should be reading. No idea what went on here. I always tape the temperature probe about 2/3 of the way to the top of the fermenter, and then put some foam over the top to insulate the probe. I didn't do anything different to all the other batches I've done.
Luckily I caught it in time as there's only a very small amount of ice covering less than 20% of the surface.
I then replaced it with another STC-1000 and that controller is reading the correct temperature as expected.
I took the "faulty" STC-1000 into my bedroom and it's reading accurately according to 2 other thermometers I have. I put the temp probe outside the window even and it's reading around 8C, just what it should be reading. No idea what went on here. I always tape the temperature probe about 2/3 of the way to the top of the fermenter, and then put some foam over the top to insulate the probe. I didn't do anything different to all the other batches I've done.
Luckily I caught it in time as there's only a very small amount of ice covering less than 20% of the surface.
Get another thermistor!
