4 Pieces 12V Electronic Temperature Controller Programmable -50 to 110 Degree Celsius Heating/Cooling Thermostat Control Switch Module Ntc Waterproof Sensor Probe Dual Color LED Display Monitor

Works well and the temperature is right on. The instructions for setting up are, as many have already reported, confusing and very frustrating to say the least. On pointer is there is not a way to set "on and off" temps. You must set H/C, my case H then off temp for Heat ( off at 50F) then set the differential at 15 if you want the heat to come on at 35F, so my battery heat pad come on at 35f and goes off at 50F. setting up for C would be the reverse I assume.

I've only just received it and did a basic test and as I said in the title , it works fine. However , the controller is the only thing you get. No paper or manual explaining anything is included. Which ok , to be fair that's not surprising though as it is just a temperature controlled relay. Problem is , the controller's relay is set to NO (or at least the one I got was) or cooling if you prefer , so the voltage isn't passed thru until it hits the temp you've set it to , which unfortunately , is the exactly opposite of what I wanted. In the end I had to look up the circuit's model number (ZFX-2062C) to find out how to change the settings , and found another page that had the settings P0-P8 and how to get to them. ** Hold the set button for 5 sec to get to the settings , Then press both the SET and C/F buttons at the same time to be able to change the setting you are currently on , then SET or C/F to actually change the setting. ** P0 is the one you want to change to set the Relay from NO to NC (from cooling to heating). Would be nice if they had the settings info and how to get to them on the amazon product page.

I purchased the same controller from 2 different sources. On one order I received the old design and on the other order I received the new design. The one I bought from (DZS Elect) was the NEW design and included an operating manual. It worked great for 3 days; but then failed and only showed LLL in the red digital display for the current temperature. I checked the probe and the wiring. The failure was internal in the controller. The NEW design controller uses surface mount rectifiers on the pc board next to the relay. Do NOT buy the new design from (DZS Elect). I bough the other controller from (Xipshow) and the controller I received was the OLD design (which is much better than the new design). The old design uses redial lead rectifiers in the pc board next to the relay. but it does not come with the operating instructions. You can get that by going on line and looking up KETOTEK Model KTF0091. It's only one page. In almost every case you can use the factory settings for operation and only change from C° to F° if that is your choice. The important point is this ----- Buy from (Xipshow) and get the OLD design. It works great with no problems.

I'm extremely happy with purchasing this compact, precise, versatile, and low current consumption temperature controller. The manual is described in the review by the Amazon customer "jcag" (4 stars, Reviewed in the United States on September 4, 2022). Yes, you need to calibrate it in the temperature range of your interest about twice a year, if you need the precise temperature control. NTC sensors are neither stable or reliable, so regular calibration is highly recommended. Yet, more precise and accurate temperature controllers that use K-type sensor are bigger and more expensive by the order of magnitude.

Horrible instructions and no wiring diagram. One of them didn’t work at all and the other was unprogramable.

The controller appears to work fine when used with a low amperage load but gets stuck repeatedly resetting when used with a higher amperage load. I purchased this controller to use in combination with a 150W ceramic heater. The electrical load of the heater is 12.5A at 12V which is well below this temperature controller's supposed maximum load of 20A at 14V. I first tried running the heater's ground directly through the controller. When the controller would close the relay, the controller would immediately turn off causing the relay to open. It would then immediately reboot and close the relay again, which would cause it to turn off again. The temperature controller stays stuck in this loop indefinitely. The controller does correctly and accurately control the heater fan (<0.5A at 12V), so the issue appears to be with running decent sized loads. I was able to get the temperature controller to control my 150W heater by connecting it to the gate of a RFP30N06LE N-Channel MOSFET and using the MOSFET to control the heater. See the attached photo of my wiring schematic. Programming the controller wasn't hard... once I found a manual. You can find it by searching for "Ketotek KTF0091". I've attached a photo of the one-page manual. I'm giving this 3 start because technically it works as intended. However, its actual load capability is substantially less that what is stated, no manual was provided, and programming it would be impossible without a manual.

This unit is a good little temperature controller. Some things to know: 1. Screw contacts are not labeled. Relay terminals will measure open (infinite resistance) both polarities. Module power input measures 15 Meg ohm when red multimeter lead is on positive, infinite resistance when leads reversed (series diode protedtion). 2. Module requires minimum 8 volts to actuate the relay. 3. Relay is rated for 10 amps AC. DC rating is generally less for a relay. 4. Module default usage is for cooling. To set for heating: a. Hold top button in for 5 seconds, this gets you to P0 - P9 parameter settings. b. Use top and bottom buttons to get to P0. c. Hold the top button in, then push bottom button in for a short amount of time. Then let go of both buttons. d. When the parameter value flashes, use the top and bottom buttons to change value. 5. The temperature difference value, P1, (hysterisis) can be changed by same method above.

Lamento informar que las unidades que compré no se programan fácilmente. Estudié las instrucciones y seguí cada paso, sin embargo, fueron difíciles de entender ya que las traducciones no son buenas. Compré 3 unidades. El primero no se puede restablecer, así que instaló el segundo. No puedo configurarlo en Cool, ni configurar la temperatura que quiero que activen los ventiladores. Está atascado en 25C (lo cual está bien pero preferiría 20C). Además, la pantalla es muy, muy brillante. Una opción de atenuación sería genial. Estoy instalando la tercera unidad para monitorear la temperatura de mi refrigeración y la activación del ventilador. No tengo esperanzas de poder programar este tampoco.