Lennox 34M74 Pressure Switch Els PW 17895 Repeated tripping typically indicates a

Repeated tripping typically indicates a low refrigerant charge

For technicians troubleshooting furnace short cycling or units that trip on high limit

non-serviceable valve designed for long-term reliability

Using it with NG would cause improper combustion and safety hazards

When the limit switch fails or detects an overheat

Lennox 34M74 Pressure Switch Els PW 17895 Repeated tripping typically indicates aThe Lennox 34M74 Pressure Switch is a critical safety component engineered for precision monitoring of combustion air in residential and commercial HVAC systems. This OEM Lennox replacement part features a single pole, single throw (SPST) electrical configuration, meticulously calibrated to an actuation point of . 33" WC (inches water column). Designed with a standard 1 4" barb connection, it ensures a secure, leak proof interface with the inducer