Variable Speed Capability: Supports advanced airflow profiles for improved dehumidification and consistent indoor comfort

The Trane SWT1271 is a critical furnace high limit switch designed for HVAC system diagnostics and thermal protection

Optimized for Class H high-temperature insulation

If the furnace inducer runs but the burners fail to ignite

Common Questions Is the 100135312 interchangeable with the BNR3430

Lochinvar & A.O. Smith 100110850 Lower Probe 318172-701 Variable Speed Capability: Supports advancedThe Lochinvar & A. O. Smith 100110850 Lower Probe is a precision engineered OEM replacement part designed for high performance commercial and residential water heating systems. As a critical immersion temperature sensor, this lower probe provides the control board with real time thermal data to regulate firing rates and maintain accurate setpoints. Built for high duty cycle environments, the 100110850 probe (also identified by part number 9006048205)