Temp Controller froze my beer.

[509inc]

Somehow setting my temp controller to 40F with a differential of 4 froze 15 gals of beer at 29F. Not sure how that happens but I blame Johnson Controls.

This never happens in my lagering fridge set to 35F with a diff of 4 using a Ranco.

 

[maida7]

where is the probe located?

 

[Hopper5000]

+1 ^^ and are you using a keezer or a refrigerator?

 

[509inc]

In the exact middle (height, distance from sides). Has been there for a year with no issues other than I find the freezer using the Johnson Controls will cool ~10F cooler that the set point.

The lager freezer right next to it uses a Ranco and is set lower and never freezes anything.

Johnson:
SP - 40F
Actual - 29F

Ranco:
SP - 35F
Actual - 35F

The freezers are in my kitchen a foot apart.

 

[maida7]

I recommend that you tape the probe to the fermenter so that it reads the temp of the fermenter and not the ambient air temp.

 

[509inc]

The probe is already touching the side of the keg. A bad controller is all I can think of because in 6 years I have never froze a keg or a carboy.

Unless someone knows of a secret setting to get the controller to shut off at the set point like it is supposed to.