{"product_id":"weil-mclain-591-391-819","title":"Weil McLain 591-391-819 Wiring Harness","description":"\u003cp\u003eThe \u003cstrong\u003eWeil McLain 591-391-819 Control Module to Igniter Wiring Harness\u003c\/strong\u003e is the short \u003cstrong\u003eOEM wiring harness\u003c\/strong\u003e that carries power from the \u003cstrong\u003econtrol module\u003c\/strong\u003e to the \u003cstrong\u003ehot surface igniter\u003c\/strong\u003e on a \u003cstrong\u003eWeil-McLain GV gas boiler\u003c\/strong\u003e. \u003cstrong\u003eWeil-McLain\u003c\/strong\u003e lists it in the \u003cstrong\u003eignition controls\u003c\/strong\u003e group of the \u003cstrong\u003eGV Series 1 and 2\u003c\/strong\u003e parts list (Fig. 4) as a wiring harness from the \u003cstrong\u003econtrol module\u003c\/strong\u003e to the \u003cstrong\u003eigniter\u003c\/strong\u003e, and in the \u003cstrong\u003eGV Series 3\u003c\/strong\u003e parts list (Fig. 6) as \"Wiring Harness, Control Module to Hot Surface Igniter.\" The harness is a \u003cstrong\u003etwo-wire lead\u003c\/strong\u003e with black and white conductors, a \u003cstrong\u003ered two-position connector\u003c\/strong\u003e on one end and a \u003cstrong\u003ewhite mating connector\u003c\/strong\u003e on the other, so it plugs in at both ends with no splicing and no crimping. The wire is printed with its gauge and temperature rating along the jacket.\u003c\/p\u003e\n\n\u003cp\u003eOn a \u003cstrong\u003ehot surface ignition\u003c\/strong\u003e boiler the \u003cstrong\u003econtrol module\u003c\/strong\u003e decides when the \u003cstrong\u003eigniter\u003c\/strong\u003e gets power, and this harness is the only path between the two. The \u003cstrong\u003eigniter\u003c\/strong\u003e itself is a separate part. The GV parts lists show the \u003cstrong\u003e511-330-148\u003c\/strong\u003e \u003cstrong\u003eigniter\u003c\/strong\u003e replacement kit, which includes a \u003cstrong\u003eNorton 271Y\u003c\/strong\u003e \u003cstrong\u003eigniter\u003c\/strong\u003e, a gasket and screws, and the \u003cstrong\u003e590-317-599\u003c\/strong\u003e \u003cstrong\u003eigniter\u003c\/strong\u003e gasket is listed beside it. Keep these three numbers straight when you diagnose a boiler that is not lighting: \u003cstrong\u003e511-330-148\u003c\/strong\u003e is the \u003cstrong\u003eigniter\u003c\/strong\u003e, \u003cstrong\u003e590-317-599\u003c\/strong\u003e is the gasket that seals it, and \u003cstrong\u003e591-391-819\u003c\/strong\u003e is the harness that feeds it.\u003c\/p\u003e\n\n\u003cp\u003eWhen a \u003cstrong\u003eGV boiler\u003c\/strong\u003e locks out without the \u003cstrong\u003eigniter\u003c\/strong\u003e ever glowing, the harness belongs on your checklist before you condemn the \u003cstrong\u003eigniter\u003c\/strong\u003e or the \u003cstrong\u003econtrol module\u003c\/strong\u003e. Look at both connector housings for discoloration, melting or a terminal that has backed out of its cavity, because a loose pin runs hot and gets worse with every call for heat. Check the insulation where the harness passes the blower housing and the jacket edges for chafing, then disconnect both ends and test each conductor for \u003cstrong\u003econtinuity\u003c\/strong\u003e. A harness with a cooked connector should be replaced rather than cleaned, since the damage is inside the housing where you cannot reach it. Route the new harness the way the old one ran, away from hot surfaces and sharp edges, and seat both connectors until they latch.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eKey Benefits\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDedicated Ignition Path:\u003c\/strong\u003e Connects the \u003cstrong\u003econtrol module\u003c\/strong\u003e to the \u003cstrong\u003ehot surface igniter\u003c\/strong\u003e and does nothing else, which keeps diagnosis simple.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eListed by Weil-McLain:\u003c\/strong\u003e Shown on the \u003cstrong\u003eGV Series 1 and 2\u003c\/strong\u003e parts list and on the \u003cstrong\u003eGV Series 3\u003c\/strong\u003e parts list.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePlug-In Connectors:\u003c\/strong\u003e A \u003cstrong\u003ered two-position connector\u003c\/strong\u003e and a \u003cstrong\u003ewhite mating connector\u003c\/strong\u003e are already on the leads, so there is no splicing or crimping.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePairs With the Igniter Parts:\u003c\/strong\u003e Order alongside the \u003cstrong\u003e511-330-148\u003c\/strong\u003e \u003cstrong\u003eigniter\u003c\/strong\u003e kit and the \u003cstrong\u003e590-317-599\u003c\/strong\u003e gasket when the whole ignition circuit is being refreshed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eCommon Questions\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWhat does the 591-391-819 connect?\u003c\/strong\u003e It connects the \u003cstrong\u003econtrol module\u003c\/strong\u003e to the \u003cstrong\u003ehot surface igniter\u003c\/strong\u003e on the \u003cstrong\u003eGV boiler\u003c\/strong\u003e, as the \u003cstrong\u003eWeil-McLain\u003c\/strong\u003e parts lists describe it.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eIs this the same as the other GV harnesses?\u003c\/strong\u003e No. The \u003cstrong\u003e591-391-820\u003c\/strong\u003e is the \u003cstrong\u003e9-pin\u003c\/strong\u003e control harness for the \u003cstrong\u003ethermostat\u003c\/strong\u003e, limit, \u003cstrong\u003epressure switch\u003c\/strong\u003e and \u003cstrong\u003egas valve\u003c\/strong\u003e, and the \u003cstrong\u003e591-391-824\u003c\/strong\u003e serves the \u003cstrong\u003edual circulators\u003c\/strong\u003e on the \u003cstrong\u003eGV Series 3\u003c\/strong\u003e. The \u003cstrong\u003e591-391-819\u003c\/strong\u003e is the \u003cstrong\u003eigniter\u003c\/strong\u003e lead.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eHow do I tell a bad harness from a bad igniter?\u003c\/strong\u003e Check the connector housings and the \u003cstrong\u003econtinuity\u003c\/strong\u003e of each conductor with the harness unplugged at both ends. If the harness tests good and the \u003cstrong\u003eigniter\u003c\/strong\u003e does not glow, move on to the \u003cstrong\u003eigniter\u003c\/strong\u003e and the \u003cstrong\u003econtrol module\u003c\/strong\u003e.\u003c\/li\u003e\n\u003c\/ul\u003e\n\nDisclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.","brand":"Weil McLain","offers":[{"title":"Default Title","offer_id":68025748062386,"sku":"591-391-819","price":19.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1838\/2375\/files\/591-391-819.jpg?v=1794598319","url":"https:\/\/www.gsistore.com\/products\/weil-mclain-591-391-819","provider":"GSIstore","version":"1.0","type":"link"}