{"product_id":"oem-lennox-high-pressure-switch-31j37","title":"OEM Lennox High Pressure Switch — 31J37","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e31J37\u003c\/strong\u003e high pressure switch is a critical safety control that monitors refrigerant pressure on the high side of your Lennox air conditioner or heat pump. If system pressure climbs to unsafe levels — from a dirty condenser coil, blocked airflow, an overcharge, or a failing compressor — the \u003cstrong\u003e31J37\u003c\/strong\u003e opens the circuit and shuts the system down to prevent catastrophic compressor damage and protect your equipment.\u003c\/p\u003e\u003cp\u003eCommon signs of a faulty high pressure switch include a system that repeatedly trips off on hot days, a unit that won't start even though the thermostat is calling for cooling, nuisance lockouts, or a compressor that runs but then cuts out shortly after. A stuck-open switch prevents operation entirely, while a stuck-closed switch removes the protection your compressor depends on.\u003c\/p\u003e\u003cp\u003eOEM matters here because the \u003cstrong\u003e31J37\u003c\/strong\u003e is calibrated to the exact cut-out and cut-in pressure thresholds Lennox specifies for your system. Using a substitute switch with the wrong trip point can leave your compressor unprotected or cause false shutdowns. The factory part guarantees correct calibration, fitment, and electrical connections for safe, reliable protection.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081109356915,"sku":"LNX-31J37","price":24.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-pressure-switch-single-LNX-31J37.jpg?v=1783761983","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-high-pressure-switch-31j37","provider":"National HVAC Parts","version":"1.0","type":"link"}