{"product_id":"oem-lennox-relay-10p21","title":"OEM Lennox Relay — 10P21","description":"\u003cp\u003eThe genuine OEM Lennox \u003cstrong\u003e10P21\u003c\/strong\u003e relay is an electrically operated switch that controls power to key components in your Lennox furnace or air handler — such as the blower motor, fan, or auxiliary heat. When the low-voltage control circuit energizes the relay coil, its contacts close to route line-voltage power to the connected load, allowing your thermostat to safely command high-current devices. This relay is engineered to the exact specifications required for reliable operation in Lennox equipment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCommon failure symptoms\u003c\/strong\u003e include a blower or fan that will not start, intermittent operation, an audible buzzing or chattering from the control box, pitted or welded contacts, or a burnt-electrical smell near the relay. A failed \u003cstrong\u003e10P21\u003c\/strong\u003e often leaves the system with control power but no output to the driven component.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy OEM matters:\u003c\/strong\u003e Lennox systems are designed around precise coil voltages and contact ratings. An OEM \u003cstrong\u003e10P21\u003c\/strong\u003e relay guarantees the correct pull-in voltage, contact amperage, and physical fit — protecting downstream motors and boards from the arcing and voltage irregularities that off-spec substitutes can cause. Choosing the factory-authorized part means a direct, trouble-free replacement and rated performance for the life of your Lennox equipment.\u003c\/p\u003e","brand":"Lennox","offers":[{"title":"Default Title","offer_id":63081136652659,"sku":"LNX-10P21","price":24.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/1190\/5395\/files\/nhvac-relay-fan-LNX-10P21.jpg?v=1783763300","url":"https:\/\/nationalhvacparts.com\/products\/oem-lennox-relay-10p21","provider":"National HVAC Parts","version":"1.0","type":"link"}