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W1209 DC 12V Heat Cool/ Thermostat Temperature Control Switch

W1209 DC 12V Heat Cool/ Thermostat Temperature Control Switch

Regular price $7.00 USD
Regular price $8.00 USD Sale price $7.00 USD
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The W1209 is a highly functional thermostat controller, with this module you can intelligently control power to most types of electrical device based on the temperature sensed by the included high accuracy NTC temperature sensor. Although this module has an embedded microcontroller no programming knowledge is required. Three tactile switches allow for configuring various parameters including on & off trigger temperatures. The on board relay can switch up to a maximum of 240V AC at 5A or 14V DC at 10A. The current temperature is displayed in degrees Centigrade via its 3 digit seven segment display and the current relay state by an on board LED.



  • Temperature Control Range: -50 ~ 110 C
  • Resolution at -9.9 to 99.9: 0.1 C
  • Resolution at all other temperatures: 1 C
  • Measurement Accuracy: 0.1 C
  • Control Accuracy: 0.1 C
  • Refresh Rate: 0.5 Seconds
  • Input Power (DC): 12V
  • Measuring Inputs: NTC (10K 0.5%)
  • Waterproof Sensor: 0.5M
  • Output: 1 Channel Relay Output, Capacity: 10A


Settings Chart

Long press the “SET” button to activate the menu.

Code Description Range Default ValueP0 Heat C/H C
P1 Backlash Set 0.1-15 2
P2 Upper Limit 110 110
P3 Lower Limit -50 -50
P4 Correction -7.0 ~ 7.0 0
P5 Delay Start Time 0-10 mins 0
P6 High Temperature Alarm 0-110 OFF
Long pressing +- will reset all values to their default


Instructions for use:

Connect the module to the power supply, then measuring temperature is displayed. Press the "SET" button, press " + or - " to set the desired temperature (long press " + or - " to quickly increase or decrease), press "SET" to confirm the setting. Automatically performs the relay ON/OFF. The thermostat output is 10A relay, meet a variety of high-power loads.

LED Indicator: LED off indicates the relay off, Lighting: indicates the relay is closed.
Digital LED Tubes: "LL" indicates sensor open, "HH" indicates overrange, the relay will be forcibly disconnected, "---" indicates high temperature alarm.

Long press the "SET" button to enter the main menu settings, press " + or - " to switching between P0-P6, then long press "SET" or 10 seconds without keystrokes to confirm the setting and return.

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