Resolve Common Error Codes - An essential fix for experiencing common malfunctions, such as the indicator light flashing 9 times or system shutdowns due to temperature sensing failures. By providing accurate real-time data to the control module, it helps pilot light issues and prevents unexpected cold water bursts High- Temperature Monitoring - Equipped with a sensitive thermistor , this sensor accurately monitors the combustion chamber temperature. It provides the critical data needed to regulate the combustion process optimally, ensuring a consistent of hot water while maintaining efficiency and system safety Perfect Compatibility & Direct Replacement - Specifically engineered to replace part number AP19299. This thermistor chamber sensor is a -fit replacement for Ultra Low NOx tankless and select boiler models. It ensures seamless integration with your existing system's control board for restored functionality Construction for - Constructed with brass probe and high-grade heat- plastic housing. The sensor is built to withstand the intense thermal environment and moisture inside the heating chamber, resisting and material degradation for reliable, long-term performance Simplified Installation Design - Features a standard plug-and-play connector and a 11.8-inch (. 30cm) cable, providing sufficient length for easy routing within the unit. Designed for a straightforward DIY or professional replacement process, allowing you to get your hot water system back up and running in minutes, Manufacturer: Ounfhtrttk