Lennox 26W42 Pressure Switch 321042-401 Engineered as a 120V to

Engineered as a 120V to 24V step-down transformer

Direct OEM Replacement: Verified 1:1 match for 621720R and 621300

When performing a Honeywell L4008A1015 replacement

or if the unit is short cycling despite a clean filter

specifically engineered for standard heat pump systems with electric

Lennox 26W42 Pressure Switch 321042-401 Engineered as a 120V toThe Lennox 26W42 Pressure Switch is a critical OEM component designed for high efficiency two stage furnace operation. Engineered to monitor and regulate inducer motor performance, this switch features precise dual factory set points of 0. 55" W. C. (Low) and 0. 95" W. C. (High). As a veteran grade HVAC replacement part, it ensures the sequence of operation is maintained by verifying proper vacuum pressure before allowing the ignition process to