Why is my boiler locking out on a 'no-drain' or 'pressure' fault

5-inch NPT threaded female connections

a professional-grade solution for standing pilot applications

whereas this double-pole (DPST/DPDT) model breaks both conductors

Lennox 15T89 Wire Harness 319847-401 Why is my boiler lockingFor service calls involving intermittent motor failure or communication errors in high efficiency air handlers, the Lennox 15T89 Wire Harness is the essential Genuine OEM HVAC replacement part to restore electrical integrity. This harness is engineered specifically for the Lennox motor connection, facilitating consistent power delivery and signal transmission between the control board and the blower motor. Designed to withstand the high vibration