Temperature bouncing around


My current fermentation was running well for the first few days, but now is heating / cooling too much and bouncing the temperature of the beer above and below the target (see below)

Any ideas what might be causing this? I’ve checked all the probes are in the right places etc… And even just switched it into beer constant mode last couple of days to try to simplify things!

Thanks in advance!!


1 Like

What are your Kp, Ki and Kd?
It looks like you have too much integrator action, compared to proportional.

Reduce Ki and perhaps increase Kp.

Thanks Elco! I will check when I get back to my flat. For the moment I’ve put it into fridge constant mode in a hope that will stabilise things. Will let you know.