As a veteran-grade single pole double throw (SPDT) switch

always verify the part number in the technical manual for your specific model

3 Degree Differential Between Stages

This kit resolves "stuck open" issues by replacing the armature spring and clearing the pilot orifice

Its compact design allows for direct mounting on the high-side liquid or discharge line

Lochinvar & A.O. Smith 100275527 Flue Sensor R-407C As a veteran-grade single poleThe Lochinvar & A. O. Smith 100275527 Flue Sensor with integrated grommet is a critical safety and monitoring component used across high efficiency condensing boilers and commercial water heaters. This negative temperature coefficient (NTC) thermistor provides real time flue gas temperature monitoring to the control board, ensuring the appliance operates within specified thermal limits and prevents heat exchanger damage. Designed as a direct