Most failures in the field result from over-tightening PVC fittings into the plastic ports

Verify the 120V input voltage is stable and check the secondary electrodes for proper gap settings and carbon fouling before replacing the transformer

and system regulation applications

Compatible with a wide range of York

this low pressure switch ensures your unit heater maintains peak combustion efficiency and meets strict safety protocols

Lennox 81W03 Control Board Els PW 17895 Most failures in the fieldThe Lennox 81W03 Control Board is the direct OEM replacement for the Lennox 17W70, 17W7001, and 81W0301 ignition control boards. As the central logic for your furnace, this integrated furnace control manages critical sequences, including hot surface ignition, flame sensing, and blower motor timing. It is engineered specifically for use in high efficiency units such as the Lennox G40, G43, and ML180 ML193 series. When performing a field replacement,