When diagnosing a failed condenser fan or small blower

Reliable Ignition: Provides a consistent gas stream to maintain a strong pilot flame

Rugged Housing Design: Built to withstand the heat and vibration of inducer motor operation in power-vented applications

Regular use of condensate tablets and ensuring the unit is leveled according to manufacturer specifications will prevent biological growth and standing water

the switch is faulty and requires replacement

Lennox 59W74 Pressure Switch 319852-301 When diagnosing a failed condenserThe Lennox 59W74 Pressure Switch is a critical safety component engineered for precision monitoring of inducer motor performance and flue draft integrity. This OEM Lennox furnace pressure switch transitions at a fixed set point of . 80"wc, ensuring the combustion process only initiates when proper negative pressure is established. Featuring a Single Pole Single Throw (SPST) configuration and dual 1 4" barb connections, this switch provides a reliable