Resideo S8701A1034 Ignition Module 320074-702 allowing the control board to

allowing the control board to verify draft status with high accuracy in demanding commercial and residential HVACR environments

or an open circuit reading during a continuity test

it meets ASME CSD-1 requirements for commercial applications

This genuine Bradford White replacement part ensures the system operates within original factory specifications without the risks associated with universal or generic alternatives

the S87D1004 is specifically a two-rod control requiring separate spark and sense electrodes

Resideo S8701A1034 Ignition Module 320074-702 allowing the control board toResideo S8701A1034 is a direct spark ignition (DSI) module featuring an 11 second trial for ignition and a 30 second pre purge cycle, designed for gas fired HVAC equipment including furnaces, boilers, and rooftop units. It manages burner startup by initiating a pre purge sequence to clear the combustion chamber before ignition, then provides spark ignition and flame verification for safe operation. This ignition control is commonly used as a