If the venter relay fails to close

making it compatible with high-pressure refrigerants including R-410A and R-134a

maintaining a consistent 1/8-inch spark gap to prevent nuisance lockouts

this dual pressure switch handles both regulation and safety monitoring within a single housing

Reznor 93443 Control Module R-407A If the venter relay failsReznor 93443 is a spark control module designed for use in gas fired HVAC heating equipment such as unit heaters, furnaces, and rooftop heating systems. It is used to control the ignition sequence by providing spark ignition and flame sensing to ensure safe burner operation during startup. This ignition control module is commonly used as a replacement part when the original control fails, causing ignition issues, intermittent firing, or lockout