{"product_id":"oem-lennox-pressure-switch-82m33","title":"OEM Lennox Pressure Switch — 82M33","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e82M33\u003c\/strong\u003e pressure switch is a critical safety device that confirms proper draft and venting before your furnace is allowed to ignite. It monitors the negative pressure created by the inducer motor and closes only when airflow is sufficient to safely carry combustion gases out of the home. If adequate draft isn't detected, the switch keeps the gas valve closed to prevent unsafe operation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms:\u003c\/strong\u003e the furnace inducer runs but ignition never occurs, repeated lockouts, error codes indicating an open or stuck pressure switch, short cycling, or a furnace that fails to start on cold mornings. A cracked hose, blocked port, or worn diaphragm are frequent culprits.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Lennox pressure switches are calibrated to a specific trip point measured in inches of water column, matched to your furnace's inducer and venting design. Installing a switch with the wrong setpoint can cause nuisance lockouts or, worse, allow operation under unsafe draft conditions. The OEM \u003cstrong\u003e82M33\u003c\/strong\u003e guarantees the correct calibration and fit for dependable, safe Lennox performance.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081093988723,"sku":"LNX-82M33","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-82M33.jpg?v=1783763092","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-pressure-switch-82m33","provider":"National HVAC Parts","version":"1.0","type":"link"}