This hot surface ignitor is an industry-standard universal replacement

OEM Compatibility: Authentic Rheem-Ruud 47-21711-04 engineering ensures exact electrical and mounting alignment

providing reliable load management for compressors and fan motors

This ensures the venting system is drawing air correctly before the furnace begins its ignition sequence

York S1-3730A3161 Relay Refrigerant This hot surface ignitor isThe York S1 3730A3161 Current Sensing Relay is a specialized solid state HVAC current switch designed for monitoring electrical load in high performance air handling and refrigeration systems. This OEM York replacement part operates by detecting current draw through a conductor to trigger secondary equipment, such as induction fans or humidifiers, ensuring synchronized operation with the primary blower motor. Engineered for heavy duty service, this