{"product_id":"l21020f-furnace-primary-limit-switch-40f-to-180f","title":"L210-20F Furnace Primary Limit Switch (-40°F to 180°F) - For ICP Heil Tempstar Furnaces","description":"\u003ch2\u003eL210-20F Primary Furnace Limit Switch\u003c\/h2\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCritical safety switch designed to shut down the gas valve and burner circuit if the furnace heat exchanger exceeds maximum safe operating temperatures.\u003c\/li\u003e\n\u003cli\u003eThermal setting calibrated to automatically open the circuit on temperature rise at 210°F and close (reset) at 190°F.\u003c\/li\u003e\n\u003cli\u003eConstructed with a highly responsive bimetallic disc enclosed in a temperature-resistant phenolic housing to prevent heat distortion.\u003c\/li\u003e\n\u003cli\u003eFeatures a flush-mount bracket and standard 1\/4-inch male quick-connect spade terminals for immediate electrical integration.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eReplaces \/ Cross-Reference Part Numbers\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cmeta charset=\"utf-8\"\u003eL210-20F\u003c\/li\u003e\n\u003cli\u003e34335001\u003c\/li\u003e\n\u003cli\u003e34335-001\u003c\/li\u003e\n\u003cli\u003eHQ34335001TD\u003c\/li\u003e\n\u003cli\u003e313408\u003c\/li\u003e\n\u003cli\u003e338085-758\u003c\/li\u003e\n\u003cli\u003e47-25349-06\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCompatibility \u0026amp; Fitment\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCompatible with select residential gas furnaces manufactured by International Comfort Products (ICP), Heil, and Tempstar.\u003c\/li\u003e\n\u003cli\u003eFits specific furnace models including: GDE050B12A2, GDE050B12G1, and GDE075F16A3.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhen to Replace\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eThe furnace continuously short-cycles, shutting off the burner assembly well before reaching the target thermostat temperature.\u003c\/li\u003e\n\u003cli\u003eThe furnace blower fan runs non-stop blowing cold air, indicating the system is locked out due to an open limit circuit.\u003c\/li\u003e\n\u003cli\u003eThe main control board diagnostic LED continuously flashes an error code specifically for an open high-limit switch.\u003c\/li\u003e\n\u003cli\u003eA continuity test performed with a digital multimeter displays infinite resistance (an open circuit) while the switch is resting at room temperature.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation Tips\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTurn off the main electrical breaker to the furnace and ensure the unit is completely powered down before opening the service panels.\u003c\/li\u003e\n\u003cli\u003eTake a digital photograph of the existing wire connections to ensure the leads are routed back to the correct spade terminals.\u003c\/li\u003e\n\u003cli\u003eRemove the two hex screws securing the original switch to the heat exchanger bulkhead and carefully pull the component straight out.\u003c\/li\u003e\n\u003cli\u003eAlign the new limit switch flush against the mounting surface and tighten the screws down evenly to prevent bending the mounting plate.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"BlueStarsParts","offers":[{"title":"Default Title","offer_id":45844237320381,"sku":"AZ00237947","price":18.86,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2576\/7548\/files\/AZ00237947_1_ffba4dd1-cc06-4ab4-aee6-48f70fd24800.jpg?v=1762245685","url":"https:\/\/bluestarspartstrend.com\/products\/l21020f-furnace-primary-limit-switch-40f-to-180f","provider":"BlueStars Parts","version":"1.0","type":"link"}