Lennox 81W03 Control Board Els PW 17895 this mechanical thermostat allows for

this mechanical thermostat allows for versatile control of heating

Key Benefits: Independent Adjustment: Two separate sensing elements allow for fine-tuned control of high and low actuation points within a single HVAC pressure switch assembly

or a multimeter reading showing an open circuit (infinite resistance) across the connector pins

this indicates a restricted vent pipe

114 DIA rod provides high sensitivity for accurate flame rectification measurements (microamps)

Lennox 81W03 Control Board Els PW 17895 this mechanical thermostat allows forThe 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,