Programmable Thermostat

This replacement light bulb is engineered for use with the Lennox 19V30 iComfort S30 Ultra Smart Wi-Fi Thermostat, a 7-inch high-definition color touchscreen device designed for residential HVAC applications. Rated at 19 volts and 30 watts, this bulb provides reliable illumination for the thermostat display and is compatible with Lennox communicating systems that support 3 heat and 2 cool stages, as well as most non-communicating systems when paired with an optional Equipment Interface Module. The bulb is designed to integrate seamlessly with the thermostat's 24VAC power input and 12VDC display output configuration, ensuring consistent performance in standard thermostat wiring applications using serial RSBus communications. This replacement component is ideal for HVAC technicians, facilities managers, and homeowners maintaining their Lennox smart thermostat systems. The bulb operates reliably in environments with storage humidity ratings of 5 to 95 percent non-condensing conditions at temperatures up to 104 degrees Fahrenheit. As a genuine replacement part for the Lennox 19V30, it meets OEM specifications and helps maintain optimal visibility and functionality of the touchscreen display interface. Whether you're performing routine maintenance or replacing a failed component, this 19V30 bulb ensures your thermostat continues to operate at peak performance for controlling heating and cooling cycles, managing smart home integration with Google Assistant, Alexa, Siri, and IFTTT automation platforms.