Pay in 4 interest-free payments of $19.40 Learn more
Ships within 48 hours · Estimated delivery Sep 27 - Oct 2
Disconnect the sensor and use a multimeter set to kilo-ohms
failure to close the pressure switch during the pre-purge cycle
How do I know if my contactor is bad
Space-Efficient Design: The 90-degree angle allows for precise gauge orientation in condensed piping layouts
Lennox 57M66 Pressure Switch 318820-201 Disconnect the sensor and useThe Lennox 57M66 Pressure Switch is a critical safety component designed for precise combustion air proving in high efficiency gas furnaces. Factory calibrated to actuate at 1. 41" WC, this Single Pole Single Throw (SPST) switch ensures the inducer motor is generating sufficient static pressure to vent flue gases safely before allowing the ignition sequence to proceed. As a genuine OEM replacement part, it maintains the exact specifications required
