The W3230 digital temperature controller is a microcomputer based thermostat module designed for precise heating and cooling control. Operating from a 12V DC power supply, it integrates a high current 20A relay, a bright LED temperature display, and simple front panel controls for fast configuration without additional programming. Temperature measurement is handled by an included waterproof NTC probe with a 1 metre cable. The controller supports a wide control range from -55°C to 120°C with a resolution of 0.1°C in the most commonly used range. Measurement accuracy, control accuracy, and return accuracy are all rated at 0.1°C, making the W3230 suitable for applications where stable temperature regulation is required. Heating and Cooling Operation The W3230 supports both heating and cooling modes selectable through the internal menu system. In heating mode, the relay activates when the measured temperature falls below the set point and switches off once the set point plus the return difference is reached. In cooling mode, the relay activates when the measured temperature exceeds the set point and switches off when the temperature falls below the set point minus the return difference. An adjustable return difference allows precise hysteresis control from 0.1°C up to 30°C. This prevents relay chatter and provides smooth temperature regulation for compressors, heaters, and fans. Built In Protection and Control Features The controller includes multiple protection functions to improve safety and extend equipment lifespan. A configurable delay start function allows delayed activation of heating or cooling devices after power up or cycling, with a selectable delay from 0 to 10 minutes. This feature is particularly useful for refrigeration compressors. Upper and lower temperature limits can be set to restrict the adjustable temperature range and prevent accidental over-temperature or freezing conditions. A temperature calibration function allows fine offset adjustment between -7.0°C and +7.0°C to correct sensor placement or environmental variation. Alarm support is built in with a configurable alarm temperature. If the temperature exceeds the defined range, the relay is automatically disconnected for safety. Sensor fault detection is also included with clear on screen error indicators. Menu Settings Overview P0 selects heating or cooling mode P1 sets the return difference hysteresis P2 sets the maximum allowable temperature P3 sets the minimum allowable temperature P4 applies temperature calibration offset P5 configures delay start time in minutes P6 sets the alarm temperature P7 enables data locking to retain settings after power loss P8 restores factory default settings Status Indicators and Error Codes The indicator LED flashes during delayed start operation and remains solid when the relay is energised. Sensor and temperature faults are displayed directly on the screen for quick diagnosis. LL indicates an open or disconnected temperature sensor HH indicates temperature exceeds the measurement range and the relay is disabled Double dash indicates a high temperature alarm condition Technical Specifications Input voltage DC 12V Temperature range -55°C to 120°C Resolution 0.1°C from -9.9°C to 99.9°C Control accuracy ±0.1°C Relay output single channel 20A Sensor NTC waterproof probe 1 metre Refresh rate approximately 0.5 seconds Operating environment -10°C to 60°C Dimensions 79 × 43 × 26 mm Typical Applications Incubators and reptile enclosures Fermentation and brewing control Water heaters and immersion heaters Cooling fans and ventilation systems Refrigeration and compressor control DIY thermostats and automation projects Alternative Options A higher voltage 24V W3230 temperature controller is available for systems that require a 24V DC supply. For lower power or compact applications, the W1209 temperature controller module offers a smaller and more cost effective alternative. Resources Instruction manual
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