Lennox 15W56 Pressure Switch 326058-756 Is the HK05SZ004 compatible with

Is the HK05SZ004 compatible with R-410A systems

Using an incorrectly sized diaphragm will result in immediate seal failure and zero stroke control

For technicians troubleshooting ignition failures or "3-flash" codes

this blanket is cross-compatible with York

Lennox 15W56 Pressure Switch 326058-756 Is the HK05SZ004 compatible withEnsure the safe and efficient performance of your heating system with the Lennox 15W56 Pressure Switch. This genuine OEM replacement part, also identified as 65289300, is a critical safety component designed to monitor airflow and venting pressures within the combustion chamber. Engineered specifically for Lennox furnaces and unit heaters, this SPST pressure switch features a precise 0. 43" WC setpoint and a standard 1 4" barb connection for seamless