Always verify the 1/4" NPT connection size before installation

As a technical mounting solution

Direct Compatibility: fits RV81 and 210D regulators without modification

the ignitor has likely failed

Wayne Combustion 64420-SER2 Ignition Control Els PW 17895 Always verify the 1/4" NPTThe Wayne Combustion 64420 SER2 is a direct OEM ignition control module engineered for Wayne Series 2 oil burner systems. As a critical primary control, it manages the oil burner startup cycle, ensuring precise ignition timing and continuous flame supervision. This module is the official service replacement for the 64420 002, designed to resolve common field issues such as intermittent ignition, flame failure lockouts, or complete no start conditions