The Reznor 209339 Spark Electrode (also identified as PSE-RZ9) is the direct OEM replacement engineered to deliver consistent high-voltage arcing to ignite the gas-air mixture across various unit heater and air handler platforms

The Carrier EF33CW271 Gas Valve is a genuine OEM replacement engineered for precision manifold pressure control in natural gas furnaces and packaged heating units

though a failing internal relay in the control board can also be the culprit

Designed for professional HVACR control applications

replacing the factory wiring to restore reliable motor communication

Lochinvar & A.O. Smith 100271315 Limit Switch 30067439-890 The Reznor 209339 Spark ElectrodeThe Lochinvar & A. O. Smith 100271315 Limit Switch is a critical safety component engineered for high performance hydronic and water heating systems. As a veteran technician knows, maintaining the integrity of the safety loop is non negotiable. This OEM high limit switch is designed to monitor outlet water temperature and provide a positive safety shutdown by interrupting the electrical circuit if temperatures exceed the factory set threshold,