System Protection: Prevents oil-related buildup in pumps and evaporative systems

as long as the controller is configured to accept a 10k ohm Type II NTC thermistor curve

providing greater flexibility for field modifications

forcing a manual inspection of the furnace before the system can resume operation

Technicians typically apply a liberal coat to the sensing bulb before insertion

Robertshaw 41-403 Hot Surface Ignitor System Protection: Prevents oil-related buildupThe Robertshaw 41 403 Hot Surface Ignitor (271M) is a heavy duty silicon carbide igniter designed for consistent ignition in 120V AC heating systems. As a veteran grade furnace replacement part, this unit features high purity recrystallized silicon carbide construction (Crystar), providing the structural integrity needed for demanding cycles in boilers, rooftop units, and infrared burners. It serves as the direct Robertshaw 41 403 cross reference for