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or a "clicking" sound from the compressor
non-serviceable valve designed for long-term reliability
For technicians troubleshooting furnace short cycling or units that trip on high limit
When the limit switch fails or detects an overheat
Lennox 34M74 Pressure Switch Els PW 17895 or a "clicking" sound fromThe 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
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