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Johnson Digital Temperature Controller Wired
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The Johnson A419 digital controller is used to control the temperature of a refrigerator, or similar cooling or heating device. Enter your desired temperature, called set point, and how tightly you want your temperature maintained, called differential, and let the controller do the rest.

Ranco Vrs. Johnson
This Johnson controller is very similar to our popular Ranco brand controller (FE610) in application and appearance. The advantage of the Ranco is being able to switch between cooling and and heating from the digital interface, while with the Johnson you have to take the cover off and physically remove a jumper. The advantage of the Johnson is the very attractive price.

For technical aficionados the Johnson does have a feature called Anti-Short Cycle Delay. Cycling is the rapid turning off and on of an electrical device. Over time cycling can harm your appliance. The Johnson controller allows you to set a time interval, in minutes, that keeps the controller from turning on right after it shuts off no matter what the temperature reading is. This can be very useful when you are using a 1 degree of differential setting for tight control but want your compressor or power supply to have a minimum time period of rest before it turns back on. Temperature Range of -20 to 220F.

Item # FE611
Shipping Eligible for Free Shipping Program
Availability Out Of Stock
Weight 2LBS
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4.7 / 5.0
33 Reviews
5 Stars
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1 Star
Great product, easy to use
This is a good priced and easy to operate temp controller. I am using it on an over/under "kegerator" fridge to control serving temps on my brews. Once in a while I will use it to control fermentations if my kegerator is empty and it works great.
June 12, 2015
Easy Control
Bought 2 of these to keep my wine and beer at the perfect temperature. Temp sensor is more accurate when floating, but haven't had a problem in years. May get another for a lagering refrigerator!
May 27, 2015
Unvaluable for Brewing
I bought this to use with a mini fridge to control my fermentation temps. It was really easy to setup and get running. I looked at some other models but chose this because it does both cooling and and heating. The only complaint I have, and I knew before I bought it, is that you need to open the unit up and move jumpers to change the cooling and and heating mode. This has worked flawlessly for years and I'd recommend and buy another.
May 6, 2015
Very easy to use
I use this on my keezer for regulating the temperature of my kegs. Very reliable and works great!
May 5, 2015
Great controller, easy to use
This controller works as advertised. My only problem with it is the probe is to big for the thermowell that is sold on this website.
May 5, 2015
Consistent temperature is a must
Once you figure out the jumper settings you need, it is easy to use and adjust as needed. I use this in conjunction with the FermWrap to keep my Spiedel fermenters nice and warm when the brewery is cold.
May 5, 2015
Perfect for Single Stage Control
I bought 2 of these and love them. One keeps my chest freezer at a constant 36 degrees F and the other is on stand-by for whatever I need it for. One use has been to use it in a thermwell for a glass carboy, a strong house fan, and a water bath tub fermentation. Worked great and aways does.
June 1, 2014
be careful in freezer
This works great and I am glad that if it were to fail that it would shut off. If you are using it with a freezer it does have a tendency to overshoot Temps on the cold side.
May 30, 2014
Excellent product that is easy to use
I use this controller in the garage in the winter in combination with a FermWrap heater on the fermenter. A 3/8 inch stainless steel thermowell accepts the temperature probe without a problem. I expect this controller will be going strong years from now when I finally get the dedicated brewing refrigerator.
May 23, 2014
Easy to use
The instructions are straight forward. It takes some time to understand how to change the jumpers from heating to cooling and dial in your Set Point and degree variation. I've been using this in a freezer for 6+ batches and love it. Using it with the freezer component or the heating pad/element is easy.
May 21, 2014